The patch titled
Subject: squashfs: fix inode lookup sanity checks
has been added to the -mm tree. Its filename is
squashfs-fix-inode-lookup-sanity-checks.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/squashfs-fix-inode-lookup-sanity-checks.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/squashfs-fix-inode-lookup-sanity-checks.patch
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------------------------------------------------------
From: Sean Nyekjaer <sean@xxxxxxxxxx>
Subject: squashfs: fix inode lookup sanity checks
When mouting a squashfs image created without inode compression it fails
with: "unable to read inode lookup table"
It turns out that the BLOCK_OFFSET is missing when checking the
SQUASHFS_METADATA_SIZE agaist the actual size.
Link: https://lkml.kernel.org/r/20210226092903.1473545-1-sean@xxxxxxxxxx
Fixes: eabac19e40c0 ("squashfs: add more sanity checks in inode lookup")
Signed-off-by: Sean Nyekjaer <sean@xxxxxxxxxx>
Acked-by: Phillip Lougher <phillip@xxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/squashfs/export.c | 8 ++++++--
fs/squashfs/squashfs_fs.h | 1 +
2 files changed, 7 insertions(+), 2 deletions(-)
--- a/fs/squashfs/export.c~squashfs-fix-inode-lookup-sanity-checks
+++ a/fs/squashfs/export.c
@@ -152,14 +152,18 @@ __le64 *squashfs_read_inode_lookup_table
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 >= lookup_table_start || (lookup_table_start - start) > SQUASHFS_METADATA_SIZE) {
+ if (start >= lookup_table_start ||
+ (lookup_table_start - start) >
+ (SQUASHFS_METADATA_SIZE + SQUASHFS_BLOCK_OFFSET)) {
kfree(table);
return ERR_PTR(-EINVAL);
}
--- a/fs/squashfs/squashfs_fs.h~squashfs-fix-inode-lookup-sanity-checks
+++ a/fs/squashfs/squashfs_fs.h
@@ -17,6 +17,7 @@
/* size of metadata (inode and directory) blocks */
#define SQUASHFS_METADATA_SIZE 8192
+#define SQUASHFS_BLOCK_OFFSET 2
/* default size of block device I/O */
#ifdef CONFIG_SQUASHFS_4K_DEVBLK_SIZE
_
Patches currently in -mm which might be from sean@xxxxxxxxxx are
squashfs-fix-inode-lookup-sanity-checks.patch
