| From bde545295b710bdd13a0fcd4b9fddd2383eeeb3a Mon Sep 17 00:00:00 2001 |
| From: Gao Xiang <hsiangkao@redhat.com> |
| Date: Wed, 20 Jan 2021 09:30:16 +0800 |
| Subject: erofs: fix shift-out-of-bounds of blkszbits |
| |
| From: Gao Xiang <hsiangkao@redhat.com> |
| |
| commit bde545295b710bdd13a0fcd4b9fddd2383eeeb3a upstream. |
| |
| syzbot generated a crafted bitszbits which can be shifted |
| out-of-bounds[1]. So directly print unsupported blkszbits |
| instead of blksize. |
| |
| [1] https://lore.kernel.org/r/000000000000c72ddd05b9444d2f@google.com |
| |
| Link: https://lore.kernel.org/r/20210120013016.14071-1-hsiangkao@aol.com |
| Reported-by: syzbot+c68f467cd7c45860e8d4@syzkaller.appspotmail.com |
| Reviewed-by: Chao Yu <yuchao0@huawei.com> |
| Signed-off-by: Gao Xiang <hsiangkao@redhat.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| fs/erofs/super.c | 4 ++-- |
| 1 file changed, 2 insertions(+), 2 deletions(-) |
| |
| --- a/fs/erofs/super.c |
| +++ b/fs/erofs/super.c |
| @@ -158,8 +158,8 @@ static int erofs_read_superblock(struct |
| blkszbits = dsb->blkszbits; |
| /* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */ |
| if (blkszbits != LOG_BLOCK_SIZE) { |
| - erofs_err(sb, "blksize %u isn't supported on this platform", |
| - 1 << blkszbits); |
| + erofs_err(sb, "blkszbits %u isn't supported on this platform", |
| + blkszbits); |
| goto out; |
| } |
| |
