On 26/02/2021 09:29, Sean Nyekjaer wrote:
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.
Fixes: eabac19e40c0 ("squashfs: add more sanity checks in inode lookup")
CC: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sean Nyekjaer <sean@xxxxxxxxxx>
Acked-by: phillip@xxxxxxxxxxxxxxx.
--- fs/squashfs/export.c | 8 ++++++-- fs/squashfs/squashfs_fs.h | 1 + 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/fs/squashfs/export.c b/fs/squashfs/export.c index eb02072d28dd..723763746238 100644 --- a/fs/squashfs/export.c +++ b/fs/squashfs/export.c @@ -152,14 +152,18 @@ __le64 *squashfs_read_inode_lookup_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 >= 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); } diff --git a/fs/squashfs/squashfs_fs.h b/fs/squashfs/squashfs_fs.h index 8d64edb80ebf..b3fdc8212c5f 100644 --- a/fs/squashfs/squashfs_fs.h +++ b/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
