[PATCH 6.1 70/71] blk-iocost: Pass gendisk to ioc_refresh_params

Sasha Levin
2024-03-13T16:41:23Z

From: Breno Leitao <leitao@debian.org>

[ Upstream commit e33b93650fc5364f773985a3e961e24349330d97 ]

Current kernel (d2980d8d826554fa6981d621e569a453787472f8) crashes
when blk_iocost_init for `nvme1` disk.

BUG: kernel NULL pointer dereference, address: 0000000000000050
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page

blk_iocost_init (include/asm-generic/qspinlock.h:128
include/linux/spinlock.h:203
include/linux/spinlock_api_smp.h:158
include/linux/spinlock.h:400
block/blk-iocost.c:2884)
ioc_qos_write (block/blk-iocost.c:3198)
? kretprobe_perf_func (kernel/trace/trace_kprobe.c:1566)
? kernfs_fop_write_iter (include/linux/slab.h:584 fs/kernfs/file.c:311)
? __kmem_cache_alloc_node (mm/slab.h:? mm/slub.c:3452 mm/slub.c:3491)
? _copy_from_iter (arch/x86/include/asm/uaccess_64.h:46
arch/x86/include/asm/uaccess_64.h:52
lib/iov_iter.c:183 lib/iov_iter.c:628)
? kretprobe_dispatcher (kernel/trace/trace_kprobe.c:1693)
cgroup_file_write (kernel/cgroup/cgroup.c:4061)
kernfs_fop_write_iter (fs/kernfs/file.c:334)
vfs_write (include/linux/fs.h:1849 fs/read_write.c:491
fs/read_write.c:584)
ksys_write (fs/read_write.c:637)
do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)

This happens because ioc_refresh_params() is being called without
a properly initialized ioc->rqos, which is happening later in the callee
side.

ioc_refresh_params() -> ioc_autop_idx() tries to access
ioc->rqos.disk->queue but ioc->rqos.disk is NULL, causing the BUG above.

Create function, called ioc_refresh_params_disk(), that is similar to
ioc_refresh_params() but where the "struct gendisk" could be passed as
an explicit argument. This function will be called when ioc->rqos.disk
is not initialized.

Fixes: ce57b558604e ("blk-rq-qos: make rq_qos_add and rq_qos_del more useful")

Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20230228111654.1778120-1-leitao@debian.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
block/blk-iocost.c | 26 ++++++++++++++++++++------
1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index ab5830ba23e0f..0d4bc9d8f2cac 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -801,7 +801,11 @@ static void ioc_refresh_period_us(struct ioc *ioc)
ioc_refresh_margins(ioc);
}

-static int ioc_autop_idx(struct ioc *ioc)
+/*
+ * ioc->rqos.disk isn't initialized when this function is called from
+ * the init path.
+ */
+static int ioc_autop_idx(struct ioc *ioc, struct gendisk *disk)
{
int idx = ioc->autop_idx;
const struct ioc_params *p = &autop[idx];
@@ -809,11 +813,11 @@ static int ioc_autop_idx(struct ioc *ioc)
u64 now_ns;

/* rotational? */
- if (!blk_queue_nonrot(ioc->rqos.disk->queue))
+ if (!blk_queue_nonrot(disk->queue))
return AUTOP_HDD;

/* handle SATA SSDs w/ broken NCQ */
- if (blk_queue_depth(ioc->rqos.disk->queue) == 1)
+ if (blk_queue_depth(disk->queue) == 1)
return AUTOP_SSD_QD1;

/* use one of the normal ssd sets */
@@ -902,14 +906,19 @@ static void ioc_refresh_lcoefs(struct ioc *ioc)
&c[LCOEF_WPAGE], &c[LCOEF_WSEQIO], &c[LCOEF_WRANDIO]);
}

-static bool ioc_refresh_params(struct ioc *ioc, bool force)
+/*
+ * struct gendisk is required as an argument because ioc->rqos.disk
+ * is not properly initialized when called from the init path.
+ */
+static bool ioc_refresh_params_disk(struct ioc *ioc, bool force,
+ struct gendisk *disk)
{
const struct ioc_params *p;
int idx;

lockdep_assert_held(&ioc->lock);

- idx = ioc_autop_idx(ioc);
+ idx = ioc_autop_idx(ioc, disk);
p = &autop[idx];

if (idx == ioc->autop_idx && !force)
@@ -938,6 +947,11 @@ static bool ioc_refresh_params(struct ioc *ioc, bool force)
return true;
}

+static bool ioc_refresh_params(struct ioc *ioc, bool force)
+{
+ return ioc_refresh_params_disk(ioc, force, ioc->rqos.disk);
+}
+
/*
* When an iocg accumulates too much vtime or gets deactivated, we throw away
* some vtime, which lowers the overall device utilization. As the exact amount
@@ -2884,7 +2898,7 @@ static int blk_iocost_init(struct gendisk *disk)

spin_lock_irq(&ioc->lock);
ioc->autop_idx = AUTOP_INVALID;
- ioc_refresh_params(ioc, true);
+ ioc_refresh_params_disk(ioc, true, disk);
spin_unlock_irq(&ioc->lock);

/*
--
2.43.0