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| author | Tao Ma <boyu.mt@taobao.com> | 2011-07-11 18:26:01 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-07-11 18:26:01 -0400 |
| commit | 823ba01fc07751200c43e45733925a98b73eac3a (patch) | |
| tree | c84853512445f6f56aeb0fcf8f9207222e9c80c0 | |
| parent | 598dbdf2433cad55bd44d923f67a053871e3eabf (diff) | |
| download | op-kernel-dev-823ba01fc07751200c43e45733925a98b73eac3a.zip op-kernel-dev-823ba01fc07751200c43e45733925a98b73eac3a.tar.gz | |
ext4: fix a race which could leak memory in ext4_groupinfo_create_slab()
In ext4_groupinfo_create_slab, we create ext4_groupinfo_caches within
ext4_grpinfo_slab_create_mutex, but set it outside the lock, and there
does exist some case that we may create it twice and causes a memory
leak. So set it before we call mutex_unlock.
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/mballoc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 04a3d92..2b9a71b 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2404,14 +2404,14 @@ static int ext4_groupinfo_create_slab(size_t size) slab_size, 0, SLAB_RECLAIM_ACCOUNT, NULL); + ext4_groupinfo_caches[cache_index] = cachep; + mutex_unlock(&ext4_grpinfo_slab_create_mutex); if (!cachep) { printk(KERN_EMERG "EXT4: no memory for groupinfo slab cache\n"); return -ENOMEM; } - ext4_groupinfo_caches[cache_index] = cachep; - return 0; } |
