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mm/damon/sysfs: catch commit test ctx alloc failure

Patch series "mm/damon/sysfs: fix commit test damon_ctx [de]allocation".

DAMON sysfs interface dynamically allocates and uses a damon_ctx object
for testing if given inputs for online DAMON parameters update is valid.
The object is being used without an allocation failure check, and leaked
when the test succeeds. Fix the two bugs.


This patch (of 2):

The damon_ctx for testing online DAMON parameters commit inputs is used
without its allocation failure check. This could result in an invalid
memory access. Fix it by directly returning an error when the allocation
failed.

Link: https://lkml.kernel.org/r/20251003201455.41448-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20251003201455.41448-2-sj@kernel.org
Fixes: 4c9ea539ad59 ("mm/damon/sysfs: validate user inputs from damon_sysfs_commit_input()")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> [6.15+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

SeongJae Park and committed by
Andrew Morton f0c5118e c97513cd

+2
+2
mm/damon/sysfs.c
··· 1473 1473 if (IS_ERR(param_ctx)) 1474 1474 return PTR_ERR(param_ctx); 1475 1475 test_ctx = damon_new_ctx(); 1476 + if (!test_ctx) 1477 + return -ENOMEM; 1476 1478 err = damon_commit_ctx(test_ctx, param_ctx); 1477 1479 if (err) { 1478 1480 damon_destroy_ctx(test_ctx);