diff options
| author | Phillip Lougher <phillip@squashfs.org.uk> | 2023-11-13 19:09:01 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-12-11 04:21:26 +0300 |
| commit | 12427de9439d68b8e96ba6f50b601ef15f437612 (patch) | |
| tree | ff3571cb2a307d3c05c9d58653e2e64ba7e6f55a /fs/squashfs/file.c | |
| parent | 44e3876d268be49ee810481ee3c95d8d650bf22e (diff) | |
| download | linux-12427de9439d68b8e96ba6f50b601ef15f437612.tar.xz | |
Squashfs: fix variable overflow triggered by sysbot
Sysbot reports a slab out of bounds write in squashfs_readahead().
This is ultimately caused by a file reporting an (infeasibly) large file
size (1407374883553280 bytes) with the minimum block size of 4K.
This causes variable overflow.
Link: https://lkml.kernel.org/r/20231113160901.6444-1-phillip@squashfs.org.uk
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Reported-by: syzbot+604424eb051c2f696163@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/000000000000b1fda20609ede0d1@google.com/
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs/squashfs/file.c')
| -rw-r--r-- | fs/squashfs/file.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c index 8ba8c4c50770..e8df6430444b 100644 --- a/fs/squashfs/file.c +++ b/fs/squashfs/file.c @@ -544,7 +544,8 @@ static void squashfs_readahead(struct readahead_control *ractl) struct squashfs_page_actor *actor; unsigned int nr_pages = 0; struct page **pages; - int i, file_end = i_size_read(inode) >> msblk->block_log; + int i; + loff_t file_end = i_size_read(inode) >> msblk->block_log; unsigned int max_pages = 1UL << shift; readahead_expand(ractl, start, (len | mask) + 1); |