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erofs: fix shift-out-of-bounds of blkszbits 

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>
This commit is contained in:
Gao Xiang 2021-01-20 09:30:16 +08:00 committed by Greg Kroah-Hartman
parent 706068d081
commit edaa0a0aab
1 changed files with 2 additions and 2 deletions
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4
fs/erofs/super.c
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@ -124,8 +124,8 @@ static int erofs_read_superblock(struct super_block *sb)
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;
}