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net: refine debug info in skb_checksum_help() 

syzbot uses panic_on_warn.

This means that the skb_dump() I added in the blamed commit are
not even called.

Rewrite this so that we get the needed skb dump before syzbot crashes.

Fixes: eeee4b77dc ("net: add more debug info in skb_checksum_help()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20231006173355.2254983-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2023-10-06 17:33:54 +00:00 committed by Jakub Kicinski
parent 776fe19953
commit 26c29961b1
1 changed files with 6 additions and 2 deletions
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8
net/core/dev.c
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@ -3292,15 +3292,19 @@ 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 (unlikely(offset >= skb_headlen(skb))) {
DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false);
WARN_ONCE(true, "offset (%d) >= skb_headlen() (%u)\n",
offset, skb_headlen(skb));
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 (unlikely(offset + sizeof(__sum16) > skb_headlen(skb))) {
DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false);
WARN_ONCE(true, "offset+2 (%zu) > skb_headlen() (%u)\n",
offset + sizeof(__sum16), skb_headlen(skb));
goto out;
}
ret = skb_ensure_writable(skb, offset + sizeof(__sum16));