From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Ronnie Sahlberg <lsahlber@redhat.com>,
Shyam Prasad N <sprasad@microsoft.com>,
Steve French <stfrench@microsoft.com>,
Sasha Levin <sashal@kernel.org>,
sfrench@samba.org, linux-cifs@vger.kernel.org,
samba-technical@lists.samba.org
Subject: [PATCH AUTOSEL 4.14 05/10] cifs: fix double free race when mount fails in cifs_get_root()
Date: Tue, 22 Feb 2022 21:32:28 -0500 [thread overview]
Message-ID: <20220223023233.242468-5-sashal@kernel.org> (raw)
In-Reply-To: <20220223023233.242468-1-sashal@kernel.org>
From: Ronnie Sahlberg <lsahlber@redhat.com>
[ Upstream commit 3d6cc9898efdfb062efb74dc18cfc700e082f5d5 ]
When cifs_get_root() fails during cifs_smb3_do_mount() we call
deactivate_locked_super() which eventually will call delayed_free() which
will free the context.
In this situation we should not proceed to enter the out: section in
cifs_smb3_do_mount() and free the same resources a second time.
[Thu Feb 10 12:59:06 2022] BUG: KASAN: use-after-free in rcu_cblist_dequeue+0x32/0x60
[Thu Feb 10 12:59:06 2022] Read of size 8 at addr ffff888364f4d110 by task swapper/1/0
[Thu Feb 10 12:59:06 2022] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G OE 5.17.0-rc3+ #4
[Thu Feb 10 12:59:06 2022] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.0 12/17/2019
[Thu Feb 10 12:59:06 2022] Call Trace:
[Thu Feb 10 12:59:06 2022] <IRQ>
[Thu Feb 10 12:59:06 2022] dump_stack_lvl+0x5d/0x78
[Thu Feb 10 12:59:06 2022] print_address_description.constprop.0+0x24/0x150
[Thu Feb 10 12:59:06 2022] ? rcu_cblist_dequeue+0x32/0x60
[Thu Feb 10 12:59:06 2022] kasan_report.cold+0x7d/0x117
[Thu Feb 10 12:59:06 2022] ? rcu_cblist_dequeue+0x32/0x60
[Thu Feb 10 12:59:06 2022] __asan_load8+0x86/0xa0
[Thu Feb 10 12:59:06 2022] rcu_cblist_dequeue+0x32/0x60
[Thu Feb 10 12:59:06 2022] rcu_core+0x547/0xca0
[Thu Feb 10 12:59:06 2022] ? call_rcu+0x3c0/0x3c0
[Thu Feb 10 12:59:06 2022] ? __this_cpu_preempt_check+0x13/0x20
[Thu Feb 10 12:59:06 2022] ? lock_is_held_type+0xea/0x140
[Thu Feb 10 12:59:06 2022] rcu_core_si+0xe/0x10
[Thu Feb 10 12:59:06 2022] __do_softirq+0x1d4/0x67b
[Thu Feb 10 12:59:06 2022] __irq_exit_rcu+0x100/0x150
[Thu Feb 10 12:59:06 2022] irq_exit_rcu+0xe/0x30
[Thu Feb 10 12:59:06 2022] sysvec_hyperv_stimer0+0x9d/0xc0
...
[Thu Feb 10 12:59:07 2022] Freed by task 58179:
[Thu Feb 10 12:59:07 2022] kasan_save_stack+0x26/0x50
[Thu Feb 10 12:59:07 2022] kasan_set_track+0x25/0x30
[Thu Feb 10 12:59:07 2022] kasan_set_free_info+0x24/0x40
[Thu Feb 10 12:59:07 2022] ____kasan_slab_free+0x137/0x170
[Thu Feb 10 12:59:07 2022] __kasan_slab_free+0x12/0x20
[Thu Feb 10 12:59:07 2022] slab_free_freelist_hook+0xb3/0x1d0
[Thu Feb 10 12:59:07 2022] kfree+0xcd/0x520
[Thu Feb 10 12:59:07 2022] cifs_smb3_do_mount+0x149/0xbe0 [cifs]
[Thu Feb 10 12:59:07 2022] smb3_get_tree+0x1a0/0x2e0 [cifs]
[Thu Feb 10 12:59:07 2022] vfs_get_tree+0x52/0x140
[Thu Feb 10 12:59:07 2022] path_mount+0x635/0x10c0
[Thu Feb 10 12:59:07 2022] __x64_sys_mount+0x1bf/0x210
[Thu Feb 10 12:59:07 2022] do_syscall_64+0x5c/0xc0
[Thu Feb 10 12:59:07 2022] entry_SYSCALL_64_after_hwframe+0x44/0xae
[Thu Feb 10 12:59:07 2022] Last potentially related work creation:
[Thu Feb 10 12:59:07 2022] kasan_save_stack+0x26/0x50
[Thu Feb 10 12:59:07 2022] __kasan_record_aux_stack+0xb6/0xc0
[Thu Feb 10 12:59:07 2022] kasan_record_aux_stack_noalloc+0xb/0x10
[Thu Feb 10 12:59:07 2022] call_rcu+0x76/0x3c0
[Thu Feb 10 12:59:07 2022] cifs_umount+0xce/0xe0 [cifs]
[Thu Feb 10 12:59:07 2022] cifs_kill_sb+0xc8/0xe0 [cifs]
[Thu Feb 10 12:59:07 2022] deactivate_locked_super+0x5d/0xd0
[Thu Feb 10 12:59:07 2022] cifs_smb3_do_mount+0xab9/0xbe0 [cifs]
[Thu Feb 10 12:59:07 2022] smb3_get_tree+0x1a0/0x2e0 [cifs]
[Thu Feb 10 12:59:07 2022] vfs_get_tree+0x52/0x140
[Thu Feb 10 12:59:07 2022] path_mount+0x635/0x10c0
[Thu Feb 10 12:59:07 2022] __x64_sys_mount+0x1bf/0x210
[Thu Feb 10 12:59:07 2022] do_syscall_64+0x5c/0xc0
[Thu Feb 10 12:59:07 2022] entry_SYSCALL_64_after_hwframe+0x44/0xae
Reported-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/cifs/cifsfs.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 74f405a05efc3..dba0d12c3db19 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -753,6 +753,7 @@ cifs_do_mount(struct file_system_type *fs_type,
out_super:
deactivate_locked_super(sb);
+ return root;
out:
cifs_cleanup_volume_info(volume_info);
return root;
--
2.34.1
next prev parent reply other threads:[~2022-02-23 2:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-23 2:32 [PATCH AUTOSEL 4.14 01/10] mac80211_hwsim: report NOACK frames in tx_status Sasha Levin
2022-02-23 2:32 ` [PATCH AUTOSEL 4.14 02/10] mac80211_hwsim: initialize ieee80211_tx_info at hw_scan_work Sasha Levin
2022-02-23 2:32 ` [PATCH AUTOSEL 4.14 03/10] i2c: bcm2835: Avoid clock stretching timeouts Sasha Levin
2022-02-23 2:32 ` [PATCH AUTOSEL 4.14 04/10] Input: clear BTN_RIGHT/MIDDLE on buttonpads Sasha Levin
2022-02-23 2:32 ` Sasha Levin [this message]
2022-02-23 2:32 ` [PATCH AUTOSEL 4.14 06/10] USB: zaurus: support another broken Zaurus Sasha Levin
2022-02-23 2:32 ` [PATCH AUTOSEL 4.14 07/10] dmaengine: shdma: Fix runtime PM imbalance on error Sasha Levin
2022-02-23 2:32 ` [PATCH AUTOSEL 4.14 08/10] i2c: cadence: allow COMPILE_TEST Sasha Levin
2022-02-23 2:32 ` [PATCH AUTOSEL 4.14 09/10] i2c: qup: " Sasha Levin
2022-02-23 2:32 ` [PATCH AUTOSEL 4.14 10/10] net: usb: cdc_mbim: avoid altsetting toggling for Telit FN990 Sasha Levin
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