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authorSeongJae Park <sj@kernel.org>2023-11-07 02:34:07 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-11-28 20:19:58 +0300
commit76801f32d963e5854ea69fb9821d2d86b62790b9 (patch)
tree057cbc25abd3af28a0220daaff796ce40bc46fb1
parent0bf5055d5d33133c3a7cc5e4032eeb0ba7832c44 (diff)
downloadlinux-76801f32d963e5854ea69fb9821d2d86b62790b9.tar.xz
mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure
commit 84055688b6bc075c92a88e2d6c3ad26ab93919f9 upstream. DAMOS tried regions sysfs directory allocation function (damon_sysfs_scheme_regions_alloc()) is not handling the memory allocation failure. In the case, the code will dereference NULL pointer. Handle the failure to avoid such invalid access. Link: https://lkml.kernel.org/r/20231106233408.51159-3-sj@kernel.org Fixes: 9277d0367ba1 ("mm/damon/sysfs-schemes: implement scheme region directory") Signed-off-by: SeongJae Park <sj@kernel.org> Cc: <stable@vger.kernel.org> [6.2+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--mm/damon/sysfs-schemes.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 13e29fe065ab..36dcd881a19c 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -126,6 +126,9 @@ damon_sysfs_scheme_regions_alloc(void)
struct damon_sysfs_scheme_regions *regions = kmalloc(sizeof(*regions),
GFP_KERNEL);
+ if (!regions)
+ return NULL;
+
regions->kobj = (struct kobject){};
INIT_LIST_HEAD(&regions->regions_list);
regions->nr_regions = 0;