spi: spidev: remove debug messages that access spidev->spi without locking

[ Upstream commit 6b35b173dbc1711f8d272e3f322d2ad697015919 ]

The two debug messages in spidev_open() dereference spidev->spi without
taking the lock and without checking if it's not null. This can lead to
a crash. Drop the messages as they're not needed - the user-space will
get informed about ENOMEM with the syscall return value.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20230106100719.196243-2-brgl@bgdev.pl
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index d233e24..922d778 100644 (file)
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -592,7 +592,6 @@ static int spidev_open(struct inode *inode, struct file *filp)
        if (!spidev->tx_buffer) {
                spidev->tx_buffer = kmalloc(bufsiz, GFP_KERNEL);
                if (!spidev->tx_buffer) {
-                       dev_dbg(&spidev->spi->dev, "open/ENOMEM\n");
                        status = -ENOMEM;
                        goto err_find_dev;
                }
@@ -601,7 +600,6 @@ static int spidev_open(struct inode *inode, struct file *filp)
        if (!spidev->rx_buffer) {
                spidev->rx_buffer = kmalloc(bufsiz, GFP_KERNEL);
                if (!spidev->rx_buffer) {
-                       dev_dbg(&spidev->spi->dev, "open/ENOMEM\n");
                        status = -ENOMEM;
                        goto err_alloc_rx_buf;
                }