6.12-stable review patch. If anyone has any objections, please let me know.
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From: Willem de Bruijn willemb@google.com
commit 54580ccdd8a9c6821fd6f72171d435480867e4c3 upstream.
As of the blamed commit ipc6.dontfrag is always initialized at the start of udpv6_sendmsg, by ipcm6_init_sk, to either 0 or 1.
Later checks against -1 are no longer needed and the branches are now dead code.
The blamed commit had removed those branches. But I had overlooked this one case.
UDP has both a lockless fast path and a slower path for corked requests. This branch remained in the fast path.
Fixes: 096208592b09 ("ipv6: replace ipcm6_init calls with ipcm6_init_sk") Signed-off-by: Willem de Bruijn willemb@google.com Reviewed-by: Eric Dumazet edumazet@google.com Link: https://patch.msgid.link/20250307033620.411611-2-willemdebruijn.kernel@gmail... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv6/ip6_output.c | 2 -- 1 file changed, 2 deletions(-)
--- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -2043,8 +2043,6 @@ struct sk_buff *ip6_make_skb(struct sock ip6_cork_release(cork, &v6_cork); return ERR_PTR(err); } - if (ipc6->dontfrag < 0) - ipc6->dontfrag = inet6_test_bit(DONTFRAG, sk);
err = __ip6_append_data(sk, &queue, cork, &v6_cork, ¤t->task_frag, getfrag, from,