dm stats: check for and propagate alloc_percpu failure

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commit d3aa3e060c upstream.

Check alloc_precpu()'s return value and return an error from
dm_stats_init() if it fails. Update alloc_dev() to fail if
dm_stats_init() does.

Otherwise, a NULL pointer dereference will occur in dm_stats_cleanup()
even if dm-stats isn't being actively used.

Fixes: fd2ed4d252 ("dm: add statistics support")
Cc: stable@vger.kernel.org
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Jiasheng Jiang 2023-03-16 14:55:06 +08:00 • committed by Greg Kroah-Hartman

parent cc3c3ee6d0

commit 5b66e36a3e

3 changed files with 10 additions and 3 deletions

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7

drivers/md/dm-stats.c

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2

drivers/md/dm-stats.h

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4

drivers/md/dm.c

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