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net: add more debug info in skb_checksum_help() 

This is a followup of previous patch.

Dumping the stack trace is a good start, but printing
basic skb information is probably better.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-05-09 20:57:41 -07:00 committed by David S. Miller
parent d7ea0d9df2
commit eeee4b77dc
1 changed files with 6 additions and 4 deletions
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10
net/core/dev.c
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@ -3266,15 +3266,17 @@ int skb_checksum_help(struct sk_buff *skb)
offset = skb_checksum_start_offset(skb);
ret = -EINVAL;
if (WARN_ON_ONCE(offset >= skb_headlen(skb)))
if (WARN_ON_ONCE(offset >= skb_headlen(skb))) {
DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false);
goto out;
}
csum = skb_checksum(skb, offset, skb->len - offset, 0);
offset += skb->csum_offset;
if (WARN_ON_ONCE(offset + sizeof(__sum16) > skb_headlen(skb)))
if (WARN_ON_ONCE(offset + sizeof(__sum16) > skb_headlen(skb))) {
DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false);
goto out;
}
ret = skb_ensure_writable(skb, offset + sizeof(__sum16));
if (ret)
goto out;