diff options
author | Phillip Lougher <phillip@lougher.demon.co.uk> | 2011-05-23 23:33:34 -0400 |
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committer | Phillip Lougher <phillip@lougher.demon.co.uk> | 2011-05-25 13:21:33 -0400 |
commit | 1cac63cc9b2ff0d16ab2d16232b1a6ee8676a47b (patch) | |
tree | 31ee36dac4a1b351c153058ffa0799a959ba0272 /fs/squashfs/super.c | |
parent | ac51a0a7139aa93bf1176b701c86fa3d2bdf6106 (diff) |
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: | |||
261 | msblk->inode_lookup_table = NULL; | 261 | msblk->inode_lookup_table = NULL; |
262 | goto failed_mount; | 262 | goto failed_mount; |
263 | } | 263 | } |
264 | next_table = msblk->inode_lookup_table[0]; | ||
264 | 265 | ||
265 | sb->s_export_op = &squashfs_export_ops; | 266 | sb->s_export_op = &squashfs_export_ops; |
266 | 267 | ||
@@ -278,7 +279,7 @@ handle_fragments: | |||
278 | 279 | ||
279 | /* Allocate and read fragment index table */ | 280 | /* Allocate and read fragment index table */ |
280 | msblk->fragment_index = squashfs_read_fragment_index_table(sb, | 281 | msblk->fragment_index = squashfs_read_fragment_index_table(sb, |
281 | le64_to_cpu(sblk->fragment_table_start), fragments); | 282 | le64_to_cpu(sblk->fragment_table_start), next_table, fragments); |
282 | if (IS_ERR(msblk->fragment_index)) { | 283 | if (IS_ERR(msblk->fragment_index)) { |
283 | ERROR("unable to read fragment index table\n"); | 284 | ERROR("unable to read fragment index table\n"); |
284 | err = PTR_ERR(msblk->fragment_index); | 285 | err = PTR_ERR(msblk->fragment_index); |