diff mbox series

spi: spi-topcliff-pch: Fix potential double free in pch_spi_process_messages()

Message ID 1620284888-65215-1-git-send-email-f.fangjian@huawei.com (mailing list archive)
State Accepted
Commit 026a1dc1af52742c5897e64a3431445371a71871
Headers show
Series spi: spi-topcliff-pch: Fix potential double free in pch_spi_process_messages() | expand

Commit Message

Jay Fang May 6, 2021, 7:08 a.m. UTC
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@huawei.com>
---
 drivers/spi/spi-topcliff-pch.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Comments

Mark Brown May 11, 2021, 8:25 a.m. UTC | #1
On Thu, 6 May 2021 15:08:08 +0800, Jay Fang wrote:
> 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.

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] spi: spi-topcliff-pch: Fix potential double free in pch_spi_process_messages()
      commit: 026a1dc1af52742c5897e64a3431445371a71871

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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Thanks,
Mark
diff mbox series

Patch

diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c
index b887078..8c4615b 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) {