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ipack: ipoctal: fix missing allocation-failure check

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Add the missing error handling when allocating the transmit buffer to
avoid dereferencing a NULL pointer in write() should the allocation
ever fail.

Fixes: ba4dc61fe8 ("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>
This commit is contained in:
Johan Hovold 2021-09-17 13:46:20 +02:00 committed by Greg Kroah-Hartman
parent cd20d59291
commit 445c813272
1 changed files with 3 additions and 1 deletions
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4
drivers/ipack/devices/ipoctal.c
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@ -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);