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vfs: check bh->b_blocknr only if BH_Mapped is set

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Check bh->b_blocknr only if BH_Mapped is set.

akpm: I doubt if b_blocknr is ever uninitialised here, but it could
conceivably cause a problem if we're doing a lookup for block zero.

Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nikanth Karthikesan 2009-04-02 16:56:46 -07:00 committed by Linus Torvalds
parent 9a896c9a48
commit 97f76d3d19
1 changed files with 3 additions and 3 deletions
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6
fs/buffer.c
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@ -199,13 +199,13 @@ __find_get_block_slow(struct block_device *bdev, sector_t block)
head = page_buffers(page);
bh = head;
do {
if (bh->b_blocknr == block) {
if (!buffer_mapped(bh))
all_mapped = 0;
else if (bh->b_blocknr == block) {
ret = bh;
get_bh(bh);
goto out_unlock;
}
if (!buffer_mapped(bh))
all_mapped = 0;
bh = bh->b_this_page;
} while (bh != head);