https://github.com/torvalds/linux
With the commit 10befea91b61 ("mm: memcg/slab: use a single set of kmem_caches for all allocations"), it becomes possible to call kfree() from the slabs_destroy(). The functions cache_flusharray() and do_drain() calls slabs_destroy() on array_cache of the local CPU without updating the size of the array_cache. This enables the kfree() call from the slabs_destroy() to recursively call cache_flusharray() which can potentially call free_block() on the same elements of the array_cache of the local CPU and causing double free and memory corruption. To fix the issue, simply update the local CPU array_cache cache before calling slabs_destroy(). Fixes: 10befea91b61 ("mm: memcg/slab: use a single set of kmem_caches for all allocations") Signed-off-by: Shakeel Butt <shakeelb@google.com> Reviewed-by: Roman Gushchin <guro@fb.com> Tested-by: Ming Lei <ming.lei@redhat.com> Reported-by: kernel test robot <rong.a.chen@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ted Ts'o <tytso@mit.edu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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mm: slab: fix potential double free in ___cache_free
File | Mode | Size |
---|---|---|
Kconfig | -rw-r--r-- | 75.2 KB |
Makefile | -rw-r--r-- | 1.2 KB |
calibrate.c | -rw-r--r-- | 8.6 KB |
do_mounts.c | -rw-r--r-- | 14.8 KB |
do_mounts.h | -rw-r--r-- | 908 bytes |
do_mounts_initrd.c | -rw-r--r-- | 3.4 KB |
do_mounts_rd.c | -rw-r--r-- | 7.7 KB |
init_task.c | -rw-r--r-- | 6.0 KB |
initramfs.c | -rw-r--r-- | 13.9 KB |
main.c | -rw-r--r-- | 37.0 KB |
noinitramfs.c | -rw-r--r-- | 813 bytes |
version.c | -rw-r--r-- | 1.3 KB |
Computing file changes ...