From 382ef7ff1854d527f5ff394d337f5f4f4952ec18 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Fri, 17 Sep 2021 13:46:20 +0200
Subject: [PATCH] ipack: ipoctal: fix missing allocation-failure check
Git-commit: 445c8132727728dc297492a7d9fc074af3e94ba3
Patch-mainline: v5.15-rc4
References: stable-5.14.10
commit 445c8132727728dc297492a7d9fc074af3e94ba3 upstream.
Add the missing error handling when allocating the transmit buffer to
avoid dereferencing a NULL pointer in write() should the allocation
ever fail.
Fixes: ba4dc61fe8c5 ("Staging: ipack: add support for IP-OCTAL mezzanine board")
Cc: stable@vger.kernel.org # 3.5
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210917114622.5412-5-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/ipack/devices/ipoctal.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c
index 35a8ed34c0ca..64b67f0d5c04 100644
--- a/drivers/ipack/devices/ipoctal.c
+++ b/drivers/ipack/devices/ipoctal.c
@@ -386,7 +386,9 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
channel = &ipoctal->channel[i];
tty_port_init(&channel->tty_port);
- tty_port_alloc_xmit_buf(&channel->tty_port);
+ res = tty_port_alloc_xmit_buf(&channel->tty_port);
+ if (res)
+ continue;
channel->tty_port.ops = &ipoctal_tty_port_ops;
ipoctal_reset_stats(&channel->stats);
--
2.26.2