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rxrpc: Fix transmission of an abort in response to an abort

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[ Upstream commit e9c0b96ec0 ]

Under some circumstances, such as when a server socket is closing, ABORT
packets will be generated in response to incoming packets.  Unfortunately,
this also may include generating aborts in response to incoming aborts -
which may cause a cycle.  It appears this may be made possible by giving
the client a multicast address.

Fix this such that rxrpc_reject_packet() will refuse to generate aborts in
response to aborts.

Fixes: 248f219cb8 ("rxrpc: Rewrite the data and ack handling code")
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeffrey Altman <jaltman@auristor.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Junvyyang, Tencent Zhuque Lab <zhuque@tencent.com>
cc: LePremierHomme <kwqcheii@proton.me>
cc: Linus Torvalds <torvalds@linux-foundation.org>
cc: Simon Horman <horms@kernel.org>
cc: linux-afs@lists.infradead.org
Link: https://patch.msgid.link/20250717074350.3767366-5-dhowells@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Howells 2025-07-17 08:43:44 +01:00 committed by Greg Kroah-Hartman
parent 839fe96c15
commit d7c1098787
1 changed files with 3 additions and 0 deletions
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3
net/rxrpc/output.c
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@ -590,6 +590,9 @@ void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
__be32 code;
int ret, ioc;
if (sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)
return; /* Never abort an abort. */
rxrpc_see_skb(skb, rxrpc_skb_see_reject);
iov[0].iov_base = &whdr;