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squashfs: fix xattr id and id lookup sanity checks 

The checks for maximum metadata block size is missing
SQUASHFS_BLOCK_OFFSET (the two byte length count).

Link: https://lkml.kernel.org/r/2069685113.2081245.1614583677427@webmail.123-reg.co.uk
Fixes: f37aa4c736 ("squashfs: add more sanity checks in id lookup")
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Cc: Sean Nyekjaer <sean@geanix.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Phillip Lougher 2021-03-24 21:37:35 -07:00 committed by Linus Torvalds
parent c1b2028315
commit 8b44ca2b63
2 changed files with 8 additions and 4 deletions
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6
fs/squashfs/id.c
View File

@ -97,14 +97,16 @@ __le64 *squashfs_read_id_index_table(struct super_block *sb,
start = le64_to_cpu(table[n]);
end = le64_to_cpu(table[n + 1]);
if (start >= end || (end - start) > SQUASHFS_METADATA_SIZE) {
if (start >= end || (end - start) >
(SQUASHFS_METADATA_SIZE + SQUASHFS_BLOCK_OFFSET)) {
kfree(table);
return ERR_PTR(-EINVAL);
}
}
start = le64_to_cpu(table[indexes - 1]);
if (start >= id_table_start || (id_table_start - start) > SQUASHFS_METADATA_SIZE) {
if (start >= id_table_start || (id_table_start - start) >
(SQUASHFS_METADATA_SIZE + SQUASHFS_BLOCK_OFFSET)) {
kfree(table);
return ERR_PTR(-EINVAL);
}

6
fs/squashfs/xattr_id.c
View File

@ -109,14 +109,16 @@ __le64 *squashfs_read_xattr_id_table(struct super_block *sb, u64 table_start,
start = le64_to_cpu(table[n]);
end = le64_to_cpu(table[n + 1]);
if (start >= end || (end - start) > SQUASHFS_METADATA_SIZE) {
if (start >= end || (end - start) >
(SQUASHFS_METADATA_SIZE + SQUASHFS_BLOCK_OFFSET)) {
kfree(table);
return ERR_PTR(-EINVAL);
}
}
start = le64_to_cpu(table[indexes - 1]);
if (start >= table_start || (table_start - start) > SQUASHFS_METADATA_SIZE) {
if (start >= table_start || (table_start - start) >
(SQUASHFS_METADATA_SIZE + SQUASHFS_BLOCK_OFFSET)) {
kfree(table);
return ERR_PTR(-EINVAL);
}