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authorPhillip Lougher <phillip@squashfs.org.uk>2021-03-25 07:37:35 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-03-25 19:22:55 +0300
commit8b44ca2b634527151af07447a8090a5f3a043321 (patch)
treeeca98126b8d20ef308348c3916f66807cc253f55 /fs/squashfs/id.c
parentc1b2028315c6b15e8d6725e0d5884b15887d3daa (diff)
downloadlinux-8b44ca2b634527151af07447a8090a5f3a043321.tar.xz
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: f37aa4c7366e23f ("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>
Diffstat (limited to 'fs/squashfs/id.c')
-rw-r--r--fs/squashfs/id.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/squashfs/id.c b/fs/squashfs/id.c
index 11581bf31af4..ea5387679723 100644
--- a/fs/squashfs/id.c
+++ b/fs/squashfs/id.c
@@ -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);
}