linux-kernel - [PATCH 1/3] dma: imx-sdma: fix NULL pointer de-reference

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190120015851.11797-2-angus@akkea.ca>
Date:   Sat, 19 Jan 2019 18:58:49 -0700
From:   "Angus Ainslie (Purism)" <angus@...ea.ca>
To:     angus@...ea.ca
Cc:     Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] dma: imx-sdma: fix NULL pointer de-reference

On the imx8mq I get NULL pointer de-deference errors if the device
isn't passed in during allocation.

Signed-off-by: Angus Ainslie (Purism) <angus@...ea.ca>
---
 drivers/dma/imx-sdma.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 86708fb9bda1..064bc50d1e99 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -677,7 +677,7 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
 	int ret;
 	unsigned long flags;
 
-	buf_virt = dma_alloc_coherent(NULL, size, &buf_phys, GFP_KERNEL);
+	buf_virt = dma_alloc_coherent(sdma->dev, size, &buf_phys, GFP_KERNEL);
 	if (!buf_virt) {
 		return -ENOMEM;
 	}
@@ -696,7 +696,7 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
 
 	spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
 
-	dma_free_coherent(NULL, size, buf_virt, buf_phys);
+	dma_free_coherent(sdma->dev, size, buf_virt, buf_phys);
 
 	return ret;
 }
@@ -1182,8 +1182,8 @@ static int sdma_request_channel0(struct sdma_engine *sdma)
 {
 	int ret = -EBUSY;
 
-	sdma->bd0 = dma_alloc_coherent(NULL, PAGE_SIZE, &sdma->bd0_phys,
-				       GFP_NOWAIT);
+	sdma->bd0 = dma_zalloc_coherent(sdma->dev, PAGE_SIZE, &sdma->bd0_phys,
+					GFP_NOWAIT);
 	if (!sdma->bd0) {
 		ret = -ENOMEM;
 		goto out;
@@ -1205,8 +1205,8 @@ static int sdma_alloc_bd(struct sdma_desc *desc)
 	u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
 	int ret = 0;
 
-	desc->bd = dma_alloc_coherent(NULL, bd_size, &desc->bd_phys,
-				      GFP_NOWAIT);
+	desc->bd = dma_zalloc_coherent(desc->sdmac->sdma->dev, bd_size,
+			&desc->bd_phys,	GFP_NOWAIT);
 	if (!desc->bd) {
 		ret = -ENOMEM;
 		goto out;
@@ -1219,7 +1219,8 @@ static void sdma_free_bd(struct sdma_desc *desc)
 {
 	u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
 
-	dma_free_coherent(NULL, bd_size, desc->bd, desc->bd_phys);
+	dma_free_coherent(desc->sdmac->sdma->dev, bd_size, desc->bd,
+			desc->bd_phys);
 }
 
 static void sdma_desc_free(struct virt_dma_desc *vd)
@@ -1842,7 +1843,7 @@ static int sdma_init(struct sdma_engine *sdma)
 	/* Be sure SDMA has not started yet */
 	writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
 
-	sdma->channel_control = dma_alloc_coherent(NULL,
+	sdma->channel_control = dma_alloc_coherent(sdma->dev,
 			MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) +
 			sizeof(struct sdma_context_data),
 			&ccb_phys, GFP_KERNEL);
-- 
2.17.1