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| author | Phillip Lougher <phillip@lougher.demon.co.uk> | 2011-05-24 04:15:21 +0100 |
|---|---|---|
| committer | Phillip Lougher <phillip@lougher.demon.co.uk> | 2011-05-25 18:21:32 +0100 |
| commit | ac51a0a7139aa93bf1176b701c86fa3d2bdf6106 (patch) | |
| tree | 776d75b5cd1712d43feecc698b855173ed6ee57f /fs/squashfs/super.c | |
| parent | 37986f63c81bf23c856f65fc5e4830550e7f3d5b (diff) | |
| download | linux-ac51a0a7139aa93bf1176b701c86fa3d2bdf6106.tar.gz linux-ac51a0a7139aa93bf1176b701c86fa3d2bdf6106.tar.bz2 linux-ac51a0a7139aa93bf1176b701c86fa3d2bdf6106.zip | |
Squashfs: add sanity checks to lookup table reading at mount time
Fsfuzzer generates corrupted filesystems which throw a warn_on in
kmalloc. One of these is due to a corrupted superblock inodes 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 lookup 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 8f5f2781a60e..80a7119870a6 100644 --- a/fs/squashfs/super.c +++ b/fs/squashfs/super.c @@ -245,6 +245,7 @@ allocate_id_index_table: msblk->id_table = NULL; goto failed_mount; } + next_table = msblk->id_table[0]; /* Handle inode lookup table */ lookup_table_start = le64_to_cpu(sblk->lookup_table_start); @@ -253,7 +254,7 @@ allocate_id_index_table: /* Allocate and read inode lookup table */ msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb, - lookup_table_start, msblk->inodes); + lookup_table_start, next_table, msblk->inodes); if (IS_ERR(msblk->inode_lookup_table)) { ERROR("unable to read inode lookup table\n"); err = PTR_ERR(msblk->inode_lookup_table); |