Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.17 078/135] net: remove two BUG() from skb_checksum_help() | Date | Mon, 30 May 2022 09:30:36 -0400 |
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From: Eric Dumazet <edumazet@google.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@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.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 80dbbd5f6a73..178400e4d13e 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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