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authorChao Yu <chao2.yu@samsung.com>2014-05-28 04:56:09 +0400
committerJaegeuk Kim <jaegeuk@kernel.org>2014-06-04 08:34:30 +0400
commitbfec07d0f8ed78b10df3ca3bc23e27de1166ea45 (patch)
treec6134dfc647176474944cbb244bd15de4d4607ac /fs/f2fs
parentd631abdac9d541d282a1461b5aeae70aa3866e9f (diff)
downloadlinux-bfec07d0f8ed78b10df3ca3bc23e27de1166ea45.tar.xz
f2fs: avoid overflow when large directory feathure is enabled
When large directory feathure is enable, We have one case which could cause overflow in dir_buckets() as following: special case: level + dir_level >= 32 and level < MAX_DIR_HASH_DEPTH / 2. Here we define MAX_DIR_BUCKETS to limit the return value when the condition could trigger potential overflow. Changes from V1 o modify description of calculation in f2fs.txt suggested by Changman Lee. Suggested-by: Changman Lee <cm224.lee@samsung.com> Signed-off-by: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/dir.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index c3f148555c37..966acb039e3b 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -23,10 +23,10 @@ static unsigned long dir_blocks(struct inode *inode)
static unsigned int dir_buckets(unsigned int level, int dir_level)
{
- if (level < MAX_DIR_HASH_DEPTH / 2)
+ if (level + dir_level < MAX_DIR_HASH_DEPTH / 2)
return 1 << (level + dir_level);
else
- return 1 << ((MAX_DIR_HASH_DEPTH / 2 + dir_level) - 1);
+ return MAX_DIR_BUCKETS;
}
static unsigned int bucket_blocks(unsigned int level)