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>
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@ -151,6 +151,13 @@ static void fat_cache_add(struct inode *inode, struct fat_cache_id *new)
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spin_unlock(&MSDOS_I(inode)->cache_lru_lock);
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tmp = fat_cache_alloc(inode);
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if (!tmp) {
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spin_lock(&MSDOS_I(inode)->cache_lru_lock);
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MSDOS_I(inode)->nr_caches--;
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spin_unlock(&MSDOS_I(inode)->cache_lru_lock);
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return;
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}
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spin_lock(&MSDOS_I(inode)->cache_lru_lock);
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cache = fat_cache_merge(inode, new);
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if (cache != NULL) {
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