linux-kernel - [PATCH 5.4 10/72] erofs: fix shift-out-of-bounds of blkszbits

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Message-Id: <20210305120857.849561219@linuxfoundation.org>
Date:   Fri,  5 Mar 2021 13:21:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+c68f467cd7c45860e8d4@...kaller.appspotmail.com,
        Chao Yu <yuchao0@...wei.com>, Gao Xiang <hsiangkao@...hat.com>
Subject: [PATCH 5.4 10/72] erofs: fix shift-out-of-bounds of blkszbits

From: Gao Xiang <hsiangkao@...hat.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@...kaller.appspotmail.com
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Gao Xiang <hsiangkao@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/erofs/super.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -124,8 +124,8 @@ 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;
 	}