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| author |   Sean Nyekjaer <sean@geanix.com> | 2021-03-24 21:37:32 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-03-25 09:22:55 -0700 |
| commit | c1b2028315c6b15e8d6725e0d5884b15887d3daa (patch) | |
| tree | 21f9218bb3408481ed812ec0a879e721abf5b91e /fs/squashfs | |
| parent | z3fold: prevent reclaim/free race for headless pages (diff) | |
| download | linux-dev-c1b2028315c6b15e8d6725e0d5884b15887d3daa.tar.xz linux-dev-c1b2028315c6b15e8d6725e0d5884b15887d3daa.zip | |
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@geanix.com
Fixes: eabac19e40c0 ("squashfs: add more sanity checks in inode lookup")
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Acked-by: Phillip Lougher <phillip@squashfs.org.uk>
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')
| -rw-r--r-- | fs/squashfs/export.c | 8 | ||||
| -rw-r--r-- | 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 |