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Message-Id: <20220607164952.729252642@linuxfoundation.org>
Date: Tue, 7 Jun 2022 18:55:17 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 125/772] net: remove two BUG() from skb_checksum_help()
From: Eric Dumazet <edumazet@...gle.com>
[ Upstream commit d7ea0d9df2a6265b2b180d17ebc64b38105968fc ]
I have a syzbot report that managed to get a crash in skb_checksum_help()
If syzbot can trigger these BUG(), it makes sense to replace
them with more friendly WARN_ON_ONCE() since skb_checksum_help()
can instead return an error code.
Note that syzbot will still crash there, until real bug is fixed.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
net/core/dev.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 5f1ac4812277..f2ce184d7223 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3156,11 +3156,15 @@ int skb_checksum_help(struct sk_buff *skb)
}
offset = skb_checksum_start_offset(skb);
- BUG_ON(offset >= skb_headlen(skb));
+ ret = -EINVAL;
+ if (WARN_ON_ONCE(offset >= skb_headlen(skb)))
+ goto out;
+
csum = skb_checksum(skb, offset, skb->len - offset, 0);
offset += skb->csum_offset;
- BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
+ if (WARN_ON_ONCE(offset + sizeof(__sum16) > skb_headlen(skb)))
+ goto out;
ret = skb_ensure_writable(skb, offset + sizeof(__sum16));
if (ret)
--
2.35.1
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