From: Francois Romieu <romieu@fr.zoreil.com>
To: netdev@vger.kernel.org
Cc: linux-hams@vger.kernel.org, Bernard <bernard.f6bvp@gmail.com>,
Bernard Pidoux <f6bvp@free.fr>,
Thomas Osterried <thomas@osterried.de>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Eric Dumazet <edumazet@google.com>
Subject: [PATCH v2 net 1/1] rose: check NULL rose_loopback_neigh->loopback
Date: Thu, 18 Aug 2022 02:02:13 +0200 [thread overview]
Message-ID: <Yv2BhXInteHP7eJm@electric-eye.fr.zoreil.com> (raw)
From: Bernard Pidoux <f6bvp@free.fr>
Commit 3b3fd068c56e3fbea30090859216a368398e39bf added NULL check for
`rose_loopback_neigh->dev` in rose_loopback_timer() but omitted to
check rose_loopback_neigh->loopback.
It thus prevents *all* rose connect.
The reason is that a special rose_neigh loopback has a NULL device.
/proc/net/rose_neigh illustrates it via rose_neigh_show() function :
[...]
seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
rose_neigh->number,
(rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
rose_neigh->dev ? rose_neigh->dev->name : "???",
rose_neigh->count,
/proc/net/rose_neigh displays special rose_loopback_neigh->loopback as
callsign RSLOOP-0:
addr callsign dev count use mode restart t0 tf digipeaters
00001 RSLOOP-0 ??? 1 2 DCE yes 0 0
By checking rose_loopback_neigh->loopback, rose_rx_call_request() is called
even in case rose_loopback_neigh->dev is NULL. This repairs rose connections.
Verification with rose client application FPAC:
FPAC-Node v 4.1.3 (built Aug 5 2022) for LINUX (help = h)
F6BVP-4 (Commands = ?) : u
Users - AX.25 Level 2 sessions :
Port Callsign Callsign AX.25 state ROSE state NetRom status
axudp F6BVP-5 -> F6BVP-9 Connected Connected ---------
Fixes: 3b3fd068c56e ("rose: Fix Null pointer dereference in rose_send_frame()")
Signed-off-by: Bernard Pidoux <f6bvp@free.fr>
Suggested-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Thomas DL9SAU Osterried <thomas@osterried.de>
---
Regression appeared in the v5.9..v5.10 cycle. The fix above also applies as-is
to stable v5.4, stable v4.19 and stable v4.14.
net/rose/rose_loopback.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/rose/rose_loopback.c b/net/rose/rose_loopback.c
index 11c45c8c6c16..036d92c0ad79 100644
--- a/net/rose/rose_loopback.c
+++ b/net/rose/rose_loopback.c
@@ -96,7 +96,8 @@ static void rose_loopback_timer(struct timer_list *unused)
}
if (frametype == ROSE_CALL_REQUEST) {
- if (!rose_loopback_neigh->dev) {
+ if (!rose_loopback_neigh->dev &&
+ !rose_loopback_neigh->loopback) {
kfree_skb(skb);
continue;
}
--
2.37.1
next reply other threads:[~2022-08-18 0:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-18 0:02 Francois Romieu [this message]
2022-08-22 13:30 ` [PATCH v2 net 1/1] rose: check NULL rose_loopback_neigh->loopback patchwork-bot+netdevbpf
2022-08-25 18:17 ` Eric Dumazet
2022-08-26 0:02 ` Francois Romieu
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