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| author | Bob Copeland <me@bobcopeland.com> | 2008-08-15 00:40:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-15 08:35:44 -0700 |
| commit | 9419fc1c957d600093baaea247fef23cca3b4e93 (patch) | |
| tree | 532606ac97d86d8952ffcdd8f8513b1499c10bf8 /fs/omfs/bitmap.c | |
| parent | c963343a1150106819773e828c9b237ed977615b (diff) | |
| download | kernel_samsung_aries-9419fc1c957d600093baaea247fef23cca3b4e93.zip kernel_samsung_aries-9419fc1c957d600093baaea247fef23cca3b4e93.tar.gz kernel_samsung_aries-9419fc1c957d600093baaea247fef23cca3b4e93.tar.bz2 | |
omfs: fix oops when file metadata is corrupted
A fuzzed fileystem image failed with OMFS when the extent count was
used in a loop without being checked against the max number of extents.
It also provoked a signed division for an array index that was checked
as if unsigned, leading to index by -1.
omfsck will be updated to fix these cases, in the meantime bail out
gracefully.
Reported-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/omfs/bitmap.c')
| -rw-r--r-- | fs/omfs/bitmap.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/omfs/bitmap.c b/fs/omfs/bitmap.c index 697663b..e1c0ec0 100644 --- a/fs/omfs/bitmap.c +++ b/fs/omfs/bitmap.c @@ -92,7 +92,7 @@ int omfs_allocate_block(struct super_block *sb, u64 block) struct buffer_head *bh; struct omfs_sb_info *sbi = OMFS_SB(sb); int bits_per_entry = 8 * sb->s_blocksize; - int map, bit; + unsigned int map, bit; int ret = 0; u64 tmp; @@ -176,7 +176,8 @@ int omfs_clear_range(struct super_block *sb, u64 block, int count) struct omfs_sb_info *sbi = OMFS_SB(sb); int bits_per_entry = 8 * sb->s_blocksize; u64 tmp; - int map, bit, ret; + unsigned int map, bit; + int ret; tmp = block; bit = do_div(tmp, bits_per_entry); |