6.6-stable review patch. If anyone has any objections, please let me know.
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From: SeongJae Park sj@kernel.org
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 --- mm/damon/sysfs-schemes.c | 3 +++ 1 file changed, 3 insertions(+)
--- 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(®ions->regions_list); regions->nr_regions = 0;