mm/damon/sysfs-schemes: handle tried region directory allocation failure
authorSeongJae Park <sj@kernel.org>
Mon, 6 Nov 2023 23:34:08 +0000 (23:34 +0000)
committerAndrew Morton <akpm@linux-foundation.org>
Wed, 15 Nov 2023 23:30:09 +0000 (15:30 -0800)
commitae636ae2bbfd9279f5681dbf320d1da817e52b68
tree586aef3dce0fbf5ce96c5b1a2e557bf3df939c87
parent84055688b6bc075c92a88e2d6c3ad26ab93919f9
mm/damon/sysfs-schemes: handle tried region directory allocation failure

DAMON sysfs interface's before_damos_apply callback
(damon_sysfs_before_damos_apply()), which creates the DAMOS tried regions
for each DAMOS action applied region, is not handling the allocation
failure for the sysfs directory data.  As a result, NULL pointer
derefeence is possible.  Fix it by handling the case.

Link: https://lkml.kernel.org/r/20231106233408.51159-4-sj@kernel.org
Fixes: f1d13cacabe1 ("mm/damon/sysfs: implement DAMOS tried regions update command")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> [6.2+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/damon/sysfs-schemes.c