From: Tao Ma <boyu.mt@xxxxxxxxxx>
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@xxxxxxxxxx>
---
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 9a35263..c680641 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;
}
--
1.7.4
--
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