Commit 7a8630be880e ("mm/damon/sysfs: support DAMOS watermarks") on -mm
tree which introduced by a patch[1] titled
mm-damon-sysfs-support-damos-watermarks.patch allows out-of-bound access
to damon_sysfs_wmark_metric_strs[] array due to wrong bound check. This
commit fixes the wrong bound check. The issue has found by Coverity
report for linux-next.
[1] https://www.ozlabs.org/~akpm/mmotm/broken-out/mm-damon-sysfs-support-damos-watermarks.patch
Addresses-Coverity: ("Out-of-bounds read")
Fixes: 7a8630be880e ("mm/damon/sysfs: support DAMOS watermarks")
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
mm/damon/sysfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 32a9d21c0db5..fda2506c676f 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -266,7 +266,7 @@ static ssize_t metric_store(struct kobject *kobj, struct kobj_attribute *attr,
struct damon_sysfs_watermarks, kobj);
enum damos_wmark_metric metric;
- for (metric = 0; metric <= NR_DAMOS_WMARK_METRICS; metric++) {
+ for (metric = 0; metric < NR_DAMOS_WMARK_METRICS; metric++) {
if (sysfs_streq(buf, damon_sysfs_wmark_metric_strs[metric])) {
watermarks->metric = metric;
return count;
--
2.17.1
