From: Jay Fang Date: Thu, 6 May 2021 07:08:08 +0000 (+0800) Subject: spi: spi-topcliff-pch: Fix potential double free in pch_spi_process_messages() X-Git-Tag: v4.4.276~163 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0a82857600820c4907cccffff648d71ad50dd48e;p=thirdparty%2Fkernel%2Fstable.git spi: spi-topcliff-pch: Fix potential double free in pch_spi_process_messages() [ Upstream commit 026a1dc1af52742c5897e64a3431445371a71871 ] pch_spi_set_tx() frees data->pkt_tx_buff on failure of kzalloc() for data->pkt_rx_buff, but its caller, pch_spi_process_messages(), will free data->pkt_tx_buff again. Set data->pkt_tx_buff to NULL after kfree() to avoid double free. Signed-off-by: Jay Fang Link: https://lore.kernel.org/r/1620284888-65215-1-git-send-email-f.fangjian@huawei.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c index 9f30a4ab2004a..66c170e799fc4 100644 --- a/drivers/spi/spi-topcliff-pch.c +++ b/drivers/spi/spi-topcliff-pch.c @@ -589,8 +589,10 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw) data->pkt_tx_buff = kzalloc(size, GFP_KERNEL); if (data->pkt_tx_buff != NULL) { data->pkt_rx_buff = kzalloc(size, GFP_KERNEL); - if (!data->pkt_rx_buff) + if (!data->pkt_rx_buff) { kfree(data->pkt_tx_buff); + data->pkt_tx_buff = NULL; + } } if (!data->pkt_rx_buff) {