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| author | Shakeel Butt <shakeelb@google.com> | 2019-06-14 01:55:49 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-06-14 06:34:56 +0300 |
| commit | 3510955b327176fd4cbab5baa75b449f077722a2 (patch) | |
| tree | e8c1e054dd86df38c266d4f47e1912ff0bae40bb /mm/list_lru.c | |
| parent | 815744d75152078cde5391fc1e3c2d4424323fb6 (diff) | |
| download | linux-3510955b327176fd4cbab5baa75b449f077722a2.tar.xz | |
mm/list_lru.c: fix memory leak in __memcg_init_list_lru_node
Syzbot reported following memory leak:
ffffffffda RBX: 0000000000000003 RCX: 0000000000441f79
BUG: memory leak
unreferenced object 0xffff888114f26040 (size 32):
comm "syz-executor626", pid 7056, jiffies 4294948701 (age 39.410s)
hex dump (first 32 bytes):
40 60 f2 14 81 88 ff ff 40 60 f2 14 81 88 ff ff @`......@`......
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
slab_post_alloc_hook mm/slab.h:439 [inline]
slab_alloc mm/slab.c:3326 [inline]
kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
kmalloc include/linux/slab.h:547 [inline]
__memcg_init_list_lru_node+0x58/0xf0 mm/list_lru.c:352
memcg_init_list_lru_node mm/list_lru.c:375 [inline]
memcg_init_list_lru mm/list_lru.c:459 [inline]
__list_lru_init+0x193/0x2a0 mm/list_lru.c:626
alloc_super+0x2e0/0x310 fs/super.c:269
sget_userns+0x94/0x2a0 fs/super.c:609
sget+0x8d/0xb0 fs/super.c:660
mount_nodev+0x31/0xb0 fs/super.c:1387
fuse_mount+0x2d/0x40 fs/fuse/inode.c:1236
legacy_get_tree+0x27/0x80 fs/fs_context.c:661
vfs_get_tree+0x2e/0x120 fs/super.c:1476
do_new_mount fs/namespace.c:2790 [inline]
do_mount+0x932/0xc50 fs/namespace.c:3110
ksys_mount+0xab/0x120 fs/namespace.c:3319
__do_sys_mount fs/namespace.c:3333 [inline]
__se_sys_mount fs/namespace.c:3330 [inline]
__x64_sys_mount+0x26/0x30 fs/namespace.c:3330
do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xa9
This is a simple off by one bug on the error path.
Link: http://lkml.kernel.org/r/20190528043202.99980-1-shakeelb@google.com
Fixes: 60d3fd32a7a9 ("list_lru: introduce per-memcg lists")
Reported-by: syzbot+f90a420dfe2b1b03cb2c@syzkaller.appspotmail.com
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: <stable@vger.kernel.org> [4.0+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/list_lru.c')
| -rw-r--r-- | mm/list_lru.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/list_lru.c b/mm/list_lru.c index e4709fdaa8e6..927d85be32f6 100644 --- a/mm/list_lru.c +++ b/mm/list_lru.c @@ -354,7 +354,7 @@ static int __memcg_init_list_lru_node(struct list_lru_memcg *memcg_lrus, } return 0; fail: - __memcg_destroy_list_lru_node(memcg_lrus, begin, i - 1); + __memcg_destroy_list_lru_node(memcg_lrus, begin, i); return -ENOMEM; } |