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| author | Phillip Lougher <phillip@lougher.demon.co.uk> | 2011-05-24 04:33:34 +0100 |
|---|---|---|
| committer | Phillip Lougher <phillip@lougher.demon.co.uk> | 2011-05-25 18:21:33 +0100 |
| commit | 1cac63cc9b2ff0d16ab2d16232b1a6ee8676a47b (patch) | |
| tree | 31ee36dac4a1b351c153058ffa0799a959ba0272 /fs/squashfs/super.c | |
| parent | ac51a0a7139aa93bf1176b701c86fa3d2bdf6106 (diff) | |
| download | linux-1cac63cc9b2ff0d16ab2d16232b1a6ee8676a47b.tar.gz linux-1cac63cc9b2ff0d16ab2d16232b1a6ee8676a47b.tar.bz2 linux-1cac63cc9b2ff0d16ab2d16232b1a6ee8676a47b.zip | |
Squashfs: add sanity checks to fragment reading at mount time
Fsfuzzer generates corrupted filesystems which throw a warn_on in
kmalloc. One of these is due to a corrupted superblock fragments field.
Fix this by checking that the number of bytes to be read (and allocated)
does not extend into the next filesystem structure.
Also add a couple of other sanity checks of the mount-time fragment table
structures.
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
Diffstat (limited to 'fs/squashfs/super.c')
| -rw-r--r-- | fs/squashfs/super.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c index 80a7119870a6..efa8118260d4 100644 --- a/fs/squashfs/super.c +++ b/fs/squashfs/super.c @@ -261,6 +261,7 @@ allocate_id_index_table: msblk->inode_lookup_table = NULL; goto failed_mount; } + next_table = msblk->inode_lookup_table[0]; sb->s_export_op = &squashfs_export_ops; @@ -278,7 +279,7 @@ handle_fragments: /* Allocate and read fragment index table */ msblk->fragment_index = squashfs_read_fragment_index_table(sb, - le64_to_cpu(sblk->fragment_table_start), fragments); + le64_to_cpu(sblk->fragment_table_start), next_table, fragments); if (IS_ERR(msblk->fragment_index)) { ERROR("unable to read fragment index table\n"); err = PTR_ERR(msblk->fragment_index); |