linux-kernel - [PATCH] erofs: don't trigger WARN() when decompression fails

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Message-Id: <20211025074311.130395-1-hsiangkao@linux.alibaba.com>
Date:   Mon, 25 Oct 2021 15:43:11 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     linux-erofs@...ts.ozlabs.org
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Gao Xiang <hsiangkao@...ux.alibaba.com>,
        syzbot+d8aaffc3719597e8cfb4@...kaller.appspotmail.com,
        Dmitry Vyukov <dvyukov@...gle.com>, Chao Yu <chao@...nel.org>
Subject: [PATCH] erofs: don't trigger WARN() when decompression fails

syzbot reported a WARNING [1] due to corrupted compressed data.

As Dmitry said, "If this is not a kernel bug, then the code should
not use WARN. WARN if for kernel bugs and is recognized as such by
all testing systems and humans."

[1] https://lore.kernel.org/r/000000000000b3586105cf0ff45e@google.com
Reported-by: syzbot+d8aaffc3719597e8cfb4@...kaller.appspotmail.com
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Chao Yu <chao@...nel.org>
Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
---
 fs/erofs/decompressor.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index a0786b95cdf9..bf37fc76b182 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -227,7 +227,6 @@ static int z_erofs_lz4_decompress_mem(struct z_erofs_decompress_req *rq,
 		erofs_err(rq->sb, "failed to decompress %d in[%u, %u] out[%u]",
 			  ret, rq->inputsize, inputmargin, rq->outputsize);
 
-		WARN_ON(1);
 		print_hex_dump(KERN_DEBUG, "[ in]: ", DUMP_PREFIX_OFFSET,
 			       16, 1, src + inputmargin, rq->inputsize, true);
 		print_hex_dump(KERN_DEBUG, "[out]: ", DUMP_PREFIX_OFFSET,
-- 
2.24.4