diff options
| author | Andrew Morton <akpm@osdl.org> | 2005-10-30 15:03:15 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-30 17:37:27 -0800 |
| commit | a3e713b5fdd0e54c2e3c8909ccde2a98839e3a52 (patch) | |
| tree | c42c037f239de130f2efe30777df9688bf4dd022 /fs/buffer.c | |
| parent | 727a53bd535fe3bde644ac346db27456ad964083 (diff) | |
| download | linux-a3e713b5fdd0e54c2e3c8909ccde2a98839e3a52.tar.gz | |
[PATCH] __bread oops fix
If a filesystem passes an idiotic blocksize into bread(), __getblk_slow() will warn and will return NULL. We have a report (from Hubert Tonneau <hubert.tonneau@fullpliant.org>) of isofs_fill_super() doing this (passing in a silly block size) against an unplugged CDROM drive. But a couple of __getblk_slow() callers forgot to check for the NULL bh, hence oops. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/buffer.c')
| -rw-r--r-- | fs/buffer.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 75cac9ada026..35fa34977e81 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -1478,8 +1478,10 @@ EXPORT_SYMBOL(__getblk); void __breadahead(struct block_device *bdev, sector_t block, int size) { struct buffer_head *bh = __getblk(bdev, block, size); - ll_rw_block(READA, 1, &bh); - brelse(bh); + if (likely(bh)) { + ll_rw_block(READA, 1, &bh); + brelse(bh); + } } EXPORT_SYMBOL(__breadahead); @@ -1497,7 +1499,7 @@ __bread(struct block_device *bdev, sector_t block, int size) { struct buffer_head *bh = __getblk(bdev, block, size); - if (!buffer_uptodate(bh)) + if (likely(bh) && !buffer_uptodate(bh)) bh = __bread_slow(bh); return bh; } |