https://github.com/torvalds/linux
When user tries to create a DAMON context via the DAMON debugfs interface with a name of an already existing context, the context directory creation fails but a new context is created and added in the internal data structure, due to absence of the directory creation success check. As a result, memory could leak and DAMON cannot be turned on. An example test case is as below: # cd /sys/kernel/debug/damon/ # echo "off" > monitor_on # echo paddr > target_ids # echo "abc" > mk_context # echo "abc" > mk_context # echo $$ > abc/target_ids # echo "on" > monitor_on <<< fails Return value of 'debugfs_create_dir()' is expected to be ignored in general, but this is an exceptional case as DAMON feature is depending on the debugfs functionality and it has the potential duplicate name issue. This commit therefore fixes the issue by checking the directory creation failure and immediately return the error in the case. Link: https://lkml.kernel.org/r/20220821180853.2400-1-sj@kernel.org Fixes: 75c1c2b53c78 ("mm/damon/dbgfs: support multiple contexts") Signed-off-by: Badari Pulavarty <badari.pulavarty@intel.com> Signed-off-by: SeongJae Park <sj@kernel.org> Cc: <stable@vger.kernel.org> [ 5.15.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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mm/damon/dbgfs: avoid duplicate context directory creation
File | Mode | Size |
---|---|---|
Kconfig | -rw-r--r-- | 62.3 KB |
Makefile | -rw-r--r-- | 1.2 KB |
calibrate.c | -rw-r--r-- | 8.6 KB |
do_mounts.c | -rw-r--r-- | 15.5 KB |
do_mounts.h | -rw-r--r-- | 908 bytes |
do_mounts_initrd.c | -rw-r--r-- | 3.9 KB |
do_mounts_rd.c | -rw-r--r-- | 7.7 KB |
init_task.c | -rw-r--r-- | 6.1 KB |
initramfs.c | -rw-r--r-- | 17.2 KB |
main.c | -rw-r--r-- | 39.6 KB |
noinitramfs.c | -rw-r--r-- | 862 bytes |
version.c | -rw-r--r-- | 1.6 KB |
Computing file changes ...