This is a note to let you know that I've just added the patch titled spi: spi-topcliff-pch: Fix potential double free in pch_spi_process_messages() to the 5.12-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: spi-spi-topcliff-pch-fix-potential-double-free-in-pc.patch and it can be found in the queue-5.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 5b3b4db452325676be5a1124901d21e6fa60992e Author: Jay Fang <f.fangjian@xxxxxxxxxx> Date: Thu May 6 15:08:08 2021 +0800 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 <f.fangjian@xxxxxxxxxx> Link: https://lore.kernel.org/r/1620284888-65215-1-git-send-email-f.fangjian@xxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c index b459e369079f..7fb020a1d66a 100644 --- a/drivers/spi/spi-topcliff-pch.c +++ b/drivers/spi/spi-topcliff-pch.c @@ -580,8 +580,10 @@ 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) {