* [PATCH] btrfs: fix NULL pointer dereference in extent_io_tree_panic()
@ 2021-01-03 5:01 Su Yue
2021-01-03 6:52 ` Qu Wenruo
0 siblings, 1 reply; 3+ messages in thread
From: Su Yue @ 2021-01-03 5:01 UTC (permalink / raw)
To: linux-btrfs; +Cc: l
while mounting the poc image user-provided, kernel panics due to the
NULL deference of @tree->inode.
========================================================================
[ 109.663024] BTRFS error: found node 12582912 29360127 on insert of 37748736 29360127
[ 109.663032] BUG: kernel NULL pointer dereference, address: 0000000000000028
[ 109.664494] #PF: supervisor read access in kernel mode
[ 109.665543] #PF: error_code(0x0000) - not-present page
[ 109.666598] PGD 0 P4D 0
[ 109.667119] Oops: 0000 [#1] PREEMPT SMP NOPTI
[ 109.668015] CPU: 14 PID: 641 Comm: mount Tainted: G W O 5.11.0-rc1-custom #45
[ 109.669707] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ArchLinux 1.14.0-1 04/01/2014
[ 109.671607] RIP: 0010:extent_io_tree_panic.isra.0+0x6/0x30 [btrfs]
[ 109.672911] Code: 89 fe 48 c7 c7 20 0e aa c0 48 89 e5 e8 3a b9 ee dd 0f 0b be c0 13 00 00 48 c7 c7 48 0e aa c0 e8 d1 ff ff ff 0f 1f 44 00 00 55 <48> 8b 47 28 89 f1 49 c7 c0 70 0e aa c0 ba a9 02 00 00 48 c7 c6 00
[ 109.676740] RSP: 0018:ffffb76c814fb948 EFLAGS: 00010282
[ 109.677808] RAX: 00000000ffffffef RBX: 0000000001bfffff RCX: 0000000000000000
[ 109.679271] RDX: ffffb76c814fb99c RSI: 00000000ffffffef RDI: 0000000000000000
[ 109.680722] RBP: ffffb76c814fb9e0 R08: 0000000000000001 R09: 0000000000000001
[ 109.682179] R10: ffffb76c814fb658 R11: 0000000000000000 R12: ffff9acac353e500
[ 109.683629] R13: ffff9acac89a8228 R14: ffff9acac353e8c0 R15: 0000000002400000
[ 109.685092] FS: 00007fb1f7dc3580(0000) GS:ffff9acb48c00000(0000) knlGS:0000000000000000
[ 109.686749] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 109.687927] CR2: 0000000000000028 CR3: 0000000103982000 CR4: 0000000000750ee0
[ 109.689380] PKRU: 55555554
[ 109.689935] Call Trace:
[ 109.690438] ? set_extent_bit.cold+0x30/0x98 [btrfs]
[ 109.718452] set_extent_bits_nowait+0x1d/0x20 [btrfs]
[ 109.741357] add_extent_mapping+0x1e0/0x2f0 [btrs]
[ 109.761474] read_one_chunk+0x33c/0x420 [btrfs]
[ 109.781087] btrfs_read_chunk_tree+0x6a4/0x870 [btrfs]
[ 109.800486] ? kvm_sched_clock_read+0x18/0x40
[ 109.819669] open_ctree+0xb32/0x1734 [btrfs]
[ 109.838794] ? bdi_register_va+0x1b/0x20
[ 109.857812] ? super_setup_bdi_name+0x79/0xd0
[ 109.876880] btrfs_mount_root.cold+0x12/0xeb [btrfs]
[ 109.895860] ? __kmalloc_track_caller+0x217/0x3b0
[ 109.914731] legacy_get_tree+0x34/0x60
[ 109.933041] vfs_get_tree+0x2d/0xc0
[ 109.950757] vfs_kern_mount.part.0+0x78/0xc0
[ 109.968262] vfs_kern_mount+0x13/0x20
[ 109.984976] btrfs_mount+0x11f/0x3c0 [btrfs]
[ 110.001475] ? kfree+0x5ff/0x670
[ 110.017410] ? __kmalloc_track_caller+0x217/0x3b0
[ 110.033439] legacy_get_tree+0x34/0x60
[ 110.049000] vfs_get_tree+0x2d/0xc0
[ 110.064604] path_mount+0x48c/0xd30
[ 110.080199] __x64_sys_mount+0x108/0x140
[ 110.095918] do_syscall_64+0x38/0x50
[ 110.111366] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 110.126869] RIP: 0033:0x7fb1f7f42f6e
[ 110.141818] Code: 48 8b 0d 05 0f 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d d2 0e 0c 00 f7 d8 64 89 01 48
[ 110.188250] RSP: 002b:00007fff152c68a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[ 110.220331] RAX: ffffffffffffffda RBX: 00007fb1f8067264 RCX: 00007fb1f7f42f6e
[ 110.237474] RDX: 00005608be216360 RSI: 00005608be208690 RDI: 00005608be20f6c0
[ 110.254718] RBP: 00005608be208440 R08: 0000000000000000 R09: 0000000000000001
[ 110.272042] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 110.288955] R13: 00005608be20f6c0 R14: 00005608be216360 R15: 00005608be208440
[ 110.305969] Modules linked in:
[ 110.458051] CR2: 0000000000000028
[ 110.478548] ---[ end trace 3499c8e7baa57952 ]---
========================================================================
The image has a device extent whose end(29360127) is less than the start
(37748736). btrfs did warn but continued to insert the invalid sate
to device::alloc_state tree. Then tree_insert() returned -EEXIST
because of the duplicate end. extent_io_tree_panic() was to be called.
However, the @tree->inode is NULL in extent_io_tree_panic() and it
should be NULL here because that device::alloc_state io tree's member
@private is NULL by design.
Just pass @tree->fs_info as parameter to extent_io_tree_panic()
directly. Let it panic as expected at least.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208929
Fixes: 05912a3c04eb ("btrfs: drop extent_io_ops::tree_fs_info callback")
Signed-off-by: Su Yue <l@damenly.su>
---
I don't know why insert_state() code only warns about the invalid state
and extent io operations are used in so many places. So just send the
simple patch.
---
fs/btrfs/extent_io.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 6e3b72e63e42..c9cee458e001 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -676,9 +676,7 @@ alloc_extent_state_atomic(struct extent_state *prealloc)
static void extent_io_tree_panic(struct extent_io_tree *tree, int err)
{
- struct inode *inode = tree->private_data;
-
- btrfs_panic(btrfs_sb(inode->i_sb), err,
+ btrfs_panic(tree->fs_info, err,
"locking error: extent tree was modified by another thread while locked");
}
--
2.29.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] btrfs: fix NULL pointer dereference in extent_io_tree_panic()
2021-01-03 5:01 [PATCH] btrfs: fix NULL pointer dereference in extent_io_tree_panic() Su Yue
@ 2021-01-03 6:52 ` Qu Wenruo
2021-01-03 9:33 ` Su Yue
0 siblings, 1 reply; 3+ messages in thread
From: Qu Wenruo @ 2021-01-03 6:52 UTC (permalink / raw)
To: Su Yue, linux-btrfs
On 2021/1/3 下午1:01, Su Yue wrote:
> while mounting the poc image user-provided, kernel panics due to the
> NULL deference of @tree->inode.
> ========================================================================
> [ 109.663024] BTRFS error: found node 12582912 29360127 on insert of 37748736 29360127
> [ 109.663032] BUG: kernel NULL pointer dereference, address: 0000000000000028
> [ 109.664494] #PF: supervisor read access in kernel mode
> [ 109.665543] #PF: error_code(0x0000) - not-present page
> [ 109.666598] PGD 0 P4D 0
> [ 109.667119] Oops: 0000 [#1] PREEMPT SMP NOPTI
> [ 109.668015] CPU: 14 PID: 641 Comm: mount Tainted: G W O 5.11.0-rc1-custom #45
> [ 109.669707] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ArchLinux 1.14.0-1 04/01/2014
> [ 109.671607] RIP: 0010:extent_io_tree_panic.isra.0+0x6/0x30 [btrfs]
> [ 109.672911] Code: 89 fe 48 c7 c7 20 0e aa c0 48 89 e5 e8 3a b9 ee dd 0f 0b be c0 13 00 00 48 c7 c7 48 0e aa c0 e8 d1 ff ff ff 0f 1f 44 00 00 55 <48> 8b 47 28 89 f1 49 c7 c0 70 0e aa c0 ba a9 02 00 00 48 c7 c6 00
> [ 109.676740] RSP: 0018:ffffb76c814fb948 EFLAGS: 00010282
> [ 109.677808] RAX: 00000000ffffffef RBX: 0000000001bfffff RCX: 0000000000000000
> [ 109.679271] RDX: ffffb76c814fb99c RSI: 00000000ffffffef RDI: 0000000000000000
> [ 109.680722] RBP: ffffb76c814fb9e0 R08: 0000000000000001 R09: 0000000000000001
> [ 109.682179] R10: ffffb76c814fb658 R11: 0000000000000000 R12: ffff9acac353e500
> [ 109.683629] R13: ffff9acac89a8228 R14: ffff9acac353e8c0 R15: 0000000002400000
> [ 109.685092] FS: 00007fb1f7dc3580(0000) GS:ffff9acb48c00000(0000) knlGS:0000000000000000
> [ 109.686749] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 109.687927] CR2: 0000000000000028 CR3: 0000000103982000 CR4: 0000000000750ee0
> [ 109.689380] PKRU: 55555554
> [ 109.689935] Call Trace:
> [ 109.690438] ? set_extent_bit.cold+0x30/0x98 [btrfs]
> [ 109.718452] set_extent_bits_nowait+0x1d/0x20 [btrfs]
> [ 109.741357] add_extent_mapping+0x1e0/0x2f0 [btrs]
> [ 109.761474] read_one_chunk+0x33c/0x420 [btrfs]
> [ 109.781087] btrfs_read_chunk_tree+0x6a4/0x870 [btrfs]
> [ 109.800486] ? kvm_sched_clock_read+0x18/0x40
> [ 109.819669] open_ctree+0xb32/0x1734 [btrfs]
> [ 109.838794] ? bdi_register_va+0x1b/0x20
> [ 109.857812] ? super_setup_bdi_name+0x79/0xd0
> [ 109.876880] btrfs_mount_root.cold+0x12/0xeb [btrfs]
> [ 109.895860] ? __kmalloc_track_caller+0x217/0x3b0
> [ 109.914731] legacy_get_tree+0x34/0x60
> [ 109.933041] vfs_get_tree+0x2d/0xc0
> [ 109.950757] vfs_kern_mount.part.0+0x78/0xc0
> [ 109.968262] vfs_kern_mount+0x13/0x20
> [ 109.984976] btrfs_mount+0x11f/0x3c0 [btrfs]
> [ 110.001475] ? kfree+0x5ff/0x670
> [ 110.017410] ? __kmalloc_track_caller+0x217/0x3b0
> [ 110.033439] legacy_get_tree+0x34/0x60
> [ 110.049000] vfs_get_tree+0x2d/0xc0
> [ 110.064604] path_mount+0x48c/0xd30
> [ 110.080199] __x64_sys_mount+0x108/0x140
> [ 110.095918] do_syscall_64+0x38/0x50
> [ 110.111366] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 110.126869] RIP: 0033:0x7fb1f7f42f6e
> [ 110.141818] Code: 48 8b 0d 05 0f 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d d2 0e 0c 00 f7 d8 64 89 01 48
> [ 110.188250] RSP: 002b:00007fff152c68a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
> [ 110.220331] RAX: ffffffffffffffda RBX: 00007fb1f8067264 RCX: 00007fb1f7f42f6e
> [ 110.237474] RDX: 00005608be216360 RSI: 00005608be208690 RDI: 00005608be20f6c0
> [ 110.254718] RBP: 00005608be208440 R08: 0000000000000000 R09: 0000000000000001
> [ 110.272042] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> [ 110.288955] R13: 00005608be20f6c0 R14: 00005608be216360 R15: 00005608be208440
> [ 110.305969] Modules linked in:
> [ 110.458051] CR2: 0000000000000028
> [ 110.478548] ---[ end trace 3499c8e7baa57952 ]---
> ========================================================================
>
> The image has a device extent whose end(29360127) is less than the start
> (37748736). btrfs did warn but continued to insert the invalid sate
> to device::alloc_state tree. Then tree_insert() returned -EEXIST
> because of the duplicate end. extent_io_tree_panic() was to be called.
> However, the @tree->inode is NULL in extent_io_tree_panic() and it
> should be NULL here because that device::alloc_state io tree's member
> @private is NULL by design.
>
> Just pass @tree->fs_info as parameter to extent_io_tree_panic()
> directly. Let it panic as expected at least.
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208929
> Fixes: 05912a3c04eb ("btrfs: drop extent_io_ops::tree_fs_info callback")
> Signed-off-by: Su Yue <l@damenly.su>
This looks OK as a simple fix.
Reviewed-by: Qu Wenruo <wqu@suse.com>
>
> ---
> I don't know why insert_state() code only warns about the invalid state
> and extent io operations are used in so many places. So just send the
> simple patch.
Although I'd prefer a more comprehensive fix, by doing overflow check on
device extent item to reject such tree block.
Thanks,
Qu
> ---
> fs/btrfs/extent_io.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index 6e3b72e63e42..c9cee458e001 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -676,9 +676,7 @@ alloc_extent_state_atomic(struct extent_state *prealloc)
>
> static void extent_io_tree_panic(struct extent_io_tree *tree, int err)
> {
> - struct inode *inode = tree->private_data;
> -
> - btrfs_panic(btrfs_sb(inode->i_sb), err,
> + btrfs_panic(tree->fs_info, err,
> "locking error: extent tree was modified by another thread while locked");
> }
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] btrfs: fix NULL pointer dereference in extent_io_tree_panic()
2021-01-03 6:52 ` Qu Wenruo
@ 2021-01-03 9:33 ` Su Yue
0 siblings, 0 replies; 3+ messages in thread
From: Su Yue @ 2021-01-03 9:33 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs
On Sun 03 Jan 2021 at 14:52, Qu Wenruo <quwenruo.btrfs@gmx.com>
wrote:
> On 2021/1/3 下午1:01, Su Yue wrote:
>> while mounting the poc image user-provided, kernel panics due
>> to the
>> NULL deference of @tree->inode.
>> ========================================================================
>> [ 109.663024] BTRFS error: found node 12582912 29360127 on
>> insert of 37748736 29360127
>> [ 109.663032] BUG: kernel NULL pointer dereference, address:
>> 0000000000000028
>> [ 109.664494] #PF: supervisor read access in kernel mode
>> [ 109.665543] #PF: error_code(0x0000) - not-present page
>> [ 109.666598] PGD 0 P4D 0
>> [ 109.667119] Oops: 0000 [#1] PREEMPT SMP NOPTI
>> [ 109.668015] CPU: 14 PID: 641 Comm: mount Tainted: G W
>> O 5.11.0-rc1-custom #45
>> [ 109.669707] Hardware name: QEMU Standard PC (i440FX + PIIX,
>> 1996), BIOS ArchLinux 1.14.0-1 04/01/2014
>> [ 109.671607] RIP: 0010:extent_io_tree_panic.isra.0+0x6/0x30
>> [btrfs]
>> [ 109.672911] Code: 89 fe 48 c7 c7 20 0e aa c0 48 89 e5 e8 3a
>> b9 ee dd 0f 0b be c0 13 00 00 48 c7 c7 48 0e aa c0 e8 d1 ff ff
>> ff 0f 1f 44 00 00 55 <48> 8b 47 28 89 f1 49 c7 c0 70 0e aa c0
>> ba a9 02 00 00 48 c7 c6 00
>> [ 109.676740] RSP: 0018:ffffb76c814fb948 EFLAGS: 00010282
>> [ 109.677808] RAX: 00000000ffffffef RBX: 0000000001bfffff RCX:
>> 0000000000000000
>> [ 109.679271] RDX: ffffb76c814fb99c RSI: 00000000ffffffef RDI:
>> 0000000000000000
>> [ 109.680722] RBP: ffffb76c814fb9e0 R08: 0000000000000001 R09:
>> 0000000000000001
>> [ 109.682179] R10: ffffb76c814fb658 R11: 0000000000000000 R12:
>> ffff9acac353e500
>> [ 109.683629] R13: ffff9acac89a8228 R14: ffff9acac353e8c0 R15:
>> 0000000002400000
>> [ 109.685092] FS: 00007fb1f7dc3580(0000)
>> GS:ffff9acb48c00000(0000) knlGS:0000000000000000
>> [ 109.686749] CS: 0010 DS: 0000 ES: 0000 CR0:
>> 0000000080050033
>> [ 109.687927] CR2: 0000000000000028 CR3: 0000000103982000 CR4:
>> 0000000000750ee0
>> [ 109.689380] PKRU: 55555554
>> [ 109.689935] Call Trace:
>> [ 109.690438] ? set_extent_bit.cold+0x30/0x98 [btrfs]
>> [ 109.718452] set_extent_bits_nowait+0x1d/0x20 [btrfs]
>> [ 109.741357] add_extent_mapping+0x1e0/0x2f0 [btrs]
>> [ 109.761474] read_one_chunk+0x33c/0x420 [btrfs]
>> [ 109.781087] btrfs_read_chunk_tree+0x6a4/0x870 [btrfs]
>> [ 109.800486] ? kvm_sched_clock_read+0x18/0x40
>> [ 109.819669] open_ctree+0xb32/0x1734 [btrfs]
>> [ 109.838794] ? bdi_register_va+0x1b/0x20
>> [ 109.857812] ? super_setup_bdi_name+0x79/0xd0
>> [ 109.876880] btrfs_mount_root.cold+0x12/0xeb [btrfs]
>> [ 109.895860] ? __kmalloc_track_caller+0x217/0x3b0
>> [ 109.914731] legacy_get_tree+0x34/0x60
>> [ 109.933041] vfs_get_tree+0x2d/0xc0
>> [ 109.950757] vfs_kern_mount.part.0+0x78/0xc0
>> [ 109.968262] vfs_kern_mount+0x13/0x20
>> [ 109.984976] btrfs_mount+0x11f/0x3c0 [btrfs]
>> [ 110.001475] ? kfree+0x5ff/0x670
>> [ 110.017410] ? __kmalloc_track_caller+0x217/0x3b0
>> [ 110.033439] legacy_get_tree+0x34/0x60
>> [ 110.049000] vfs_get_tree+0x2d/0xc0
>> [ 110.064604] path_mount+0x48c/0xd30
>> [ 110.080199] __x64_sys_mount+0x108/0x140
>> [ 110.095918] do_syscall_64+0x38/0x50
>> [ 110.111366] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [ 110.126869] RIP: 0033:0x7fb1f7f42f6e
>> [ 110.141818] Code: 48 8b 0d 05 0f 0c 00 f7 d8 64 89 01 48 83
>> c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca
>> b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d d2
>> 0e 0c 00 f7 d8 64 89 01 48
>> [ 110.188250] RSP: 002b:00007fff152c68a8 EFLAGS: 00000246
>> ORIG_RAX: 00000000000000a5
>> [ 110.220331] RAX: ffffffffffffffda RBX: 00007fb1f8067264 RCX:
>> 00007fb1f7f42f6e
>> [ 110.237474] RDX: 00005608be216360 RSI: 00005608be208690 RDI:
>> 00005608be20f6c0
>> [ 110.254718] RBP: 00005608be208440 R08: 0000000000000000 R09:
>> 0000000000000001
>> [ 110.272042] R10: 0000000000000000 R11: 0000000000000246 R12:
>> 0000000000000000
>> [ 110.288955] R13: 00005608be20f6c0 R14: 00005608be216360 R15:
>> 00005608be208440
>> [ 110.305969] Modules linked in:
>> [ 110.458051] CR2: 0000000000000028
>> [ 110.478548] ---[ end trace 3499c8e7baa57952 ]---
>> ========================================================================
>>
>> The image has a device extent whose end(29360127) is less than
>> the start
>> (37748736). btrfs did warn but continued to insert the invalid
>> sate
>> to device::alloc_state tree. Then tree_insert() returned
>> -EEXIST
>> because of the duplicate end. extent_io_tree_panic() was to be
>> called.
>> However, the @tree->inode is NULL in extent_io_tree_panic() and
>> it
>> should be NULL here because that device::alloc_state io tree's
>> member
>> @private is NULL by design.
>>
>> Just pass @tree->fs_info as parameter to extent_io_tree_panic()
>> directly. Let it panic as expected at least.
>>
>> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208929
>> Fixes: 05912a3c04eb ("btrfs: drop extent_io_ops::tree_fs_info
>> callback")
>> Signed-off-by: Su Yue <l@damenly.su>
>
> This looks OK as a simple fix.
>
> Reviewed-by: Qu Wenruo <wqu@suse.com>
>
>>
>> ---
>> I don't know why insert_state() code only warns about the
>> invalid state
>> and extent io operations are used in so many places. So just
>> send the
>> simple patch.
>
> Although I'd prefer a more comprehensive fix, by doing overflow
> check on
> device extent item to reject such tree block.
>
Sorry, wrong commit message of mine. It's overflow of one chunk
item end.
The patch is just a fix to let btrfs reach at btrfs_panic()
successfully.
Another fix about overflow is contained in the version 2 sent
already.
Thanks.
> Thanks,
> Qu
>
>> ---
>> fs/btrfs/extent_io.c | 4 +---
>> 1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
>> index 6e3b72e63e42..c9cee458e001 100644
>> --- a/fs/btrfs/extent_io.c
>> +++ b/fs/btrfs/extent_io.c
>> @@ -676,9 +676,7 @@ alloc_extent_state_atomic(struct
>> extent_state *prealloc)
>>
>> static void extent_io_tree_panic(struct extent_io_tree *tree,
>> int err)
>> {
>> - struct inode *inode = tree->private_data;
>> -
>> - btrfs_panic(btrfs_sb(inode->i_sb), err,
>> + btrfs_panic(tree->fs_info, err,
>> "locking error: extent tree was modified by another thread
>> while locked");
>> }
>>
>>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-01-03 5:01 [PATCH] btrfs: fix NULL pointer dereference in extent_io_tree_panic() Su Yue
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