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| author | OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | 2011-04-12 21:08:38 +0900 |
|---|---|---|
| committer | OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | 2011-04-12 21:12:16 +0900 |
| commit | 700309295551ef9217e4ae00a5b1d3030fc5438c (patch) | |
| tree | 8af7a3eb476cac451183caae636cf3d144e1859d | |
| parent | 384f5c96ea05aba24a11172ebd6f5d427ca199fc (diff) | |
| download | linux-next-700309295551ef9217e4ae00a5b1d3030fc5438c.tar.gz | |
fat: Fix possible null deref in fat_cache_add()
Reported-by: <dame_eugene@mail.ru>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
| -rw-r--r-- | fs/fat/cache.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/fat/cache.c b/fs/fat/cache.c index ae8200f84e39..1cc7038e273d 100644 --- a/fs/fat/cache.c +++ b/fs/fat/cache.c @@ -151,6 +151,13 @@ static void fat_cache_add(struct inode *inode, struct fat_cache_id *new) spin_unlock(&MSDOS_I(inode)->cache_lru_lock); tmp = fat_cache_alloc(inode); + if (!tmp) { + spin_lock(&MSDOS_I(inode)->cache_lru_lock); + MSDOS_I(inode)->nr_caches--; + spin_unlock(&MSDOS_I(inode)->cache_lru_lock); + return; + } + spin_lock(&MSDOS_I(inode)->cache_lru_lock); cache = fat_cache_merge(inode, new); if (cache != NULL) { |