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s390/qeth: make af_iucv TX notification call more robust

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[ Upstream commit 34c7f50f7d0d36fa663c74aee39e25e912505320 ]

Calling into socket code is ugly already, at least check whether we are
dealing with the expected sk_family. Only looking at skb->protocol is
bound to cause troubles (consider eg. af_packet).

Fixes: b333293058 ("qeth: add support for af_iucv HiperSockets transport")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Julian Wiedmann 2020-11-20 10:09:37 +01:00 • committed by Greg Kroah-Hartman
commit bb6c548934
1 changed files with 2 additions and 1 deletions
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3
drivers/s390/net/qeth_core_main.c
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@ -31,6 +31,7 @@
#include <net/iucv/af_iucv.h>
#include <net/dsfield.h>
#include <net/sock.h>
#include <asm/ebcdic.h>
#include <asm/chpid.h>
@ -1083,7 +1084,7 @@ static void qeth_notify_skbs(struct qeth_qdio_out_q *q,
skb_queue_walk(&buf->skb_list, skb) {
QETH_CARD_TEXT_(q->card, 5, "skbn%d", notification);
QETH_CARD_TEXT_(q->card, 5, "%lx", (long) skb);
if (skb->protocol == htons(ETH_P_AF_IUCV) && skb->sk)
if (skb->sk && skb->sk->sk_family == PF_IUCV)
iucv_sk(skb->sk)->sk_txnotify(skb, notification);
}
}