linux-kernel - [PATCH 4/6] ipack: ipoctal: fix missing allocation-failure check

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Message-Id: <20210917114622.5412-5-johan@kernel.org>
Date:   Fri, 17 Sep 2021 13:46:20 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Samuel Iglesias Gonsalvez <siglesias@...lia.com>,
        Jens Taprogge <jens.taprogge@...rogge.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     industrypack-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        stable@...r.kernel.org
Subject: [PATCH 4/6] ipack: ipoctal: fix missing allocation-failure check

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@...r.kernel.org      # 3.5
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 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 d6875aa6a295..61c41f535510 100644
--- a/drivers/ipack/devices/ipoctal.c
+++ b/drivers/ipack/devices/ipoctal.c
@@ -385,7 +385,9 @@ 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);
-- 
2.32.0