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authorGustavo A. R. Silva <gustavo@embeddedor.com>2019-01-22 13:57:19 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-30 09:35:46 +0100
commit1575c083a78cc1137ad8bfa042d02eeb9dc86ef4 (patch)
tree7b570f2b2e25b2b718f9c354a5a06b3e4dc7488d /drivers
parentf17b5f06cb92ef2250513a1e154c47b78df07d40 (diff)
downloadlinux-1575c083a78cc1137ad8bfa042d02eeb9dc86ef4.tar.bz2
tty: serial: 8250_mtk: Fix potential NULL pointer dereference
There is a potential NULL pointer dereference in case devm_kzalloc() fails and returns NULL. Fix this by adding a NULL check on data->dma This bug was detected with the help of Coccinelle. Fixes: 85b5c1dd0456 ("serial: 8250-mtk: add uart DMA support") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/tty/serial/8250/8250_mtk.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index e2c407656fa6..c1fdbc0b6840 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -357,6 +357,9 @@ static int mtk8250_probe_of(struct platform_device *pdev, struct uart_port *p,
if (dmacnt == 2) {
data->dma = devm_kzalloc(&pdev->dev, sizeof(*data->dma),
GFP_KERNEL);
+ if (!data->dma)
+ return -ENOMEM;
+
data->dma->fn = mtk8250_dma_filter;
data->dma->rx_size = MTK_UART_RX_SIZE;
data->dma->rxconf.src_maxburst = MTK_UART_RX_TRIGGER;