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Groups > linux.kernel > #1687823

[PATCH for v4.9 LTS 42/87] video: fbdev: cobalt_lcdfb: Handle return NULL error from devm_ioremap

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From: Arvind Yadav <arvind.yadav.cs@gmail.com>

[ Upstream commit 4dcd19bfabaee8f9f4bcf203afba09b98ccbaf76 ]

Here, If devm_ioremap will fail. It will return NULL.
Kernel can run into a NULL-pointer dereference.
This error check will avoid NULL pointer dereference.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Acked-by: Yoichi Yuasa <yuasa@linux-mips.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
---
 drivers/video/fbdev/cobalt_lcdfb.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/video/fbdev/cobalt_lcdfb.c b/drivers/video/fbdev/cobalt_lcdfb.c
index 2d3b691f3fc4..038ac6934fe9 100644
--- a/drivers/video/fbdev/cobalt_lcdfb.c
+++ b/drivers/video/fbdev/cobalt_lcdfb.c
@@ -308,6 +308,11 @@ static int cobalt_lcdfb_probe(struct platform_device *dev)
 	info->screen_size = resource_size(res);
 	info->screen_base = devm_ioremap(&dev->dev, res->start,
 					 info->screen_size);
+	if (!info->screen_base) {
+		framebuffer_release(info);
+		return -ENOMEM;
+	}
+
 	info->fbops = &cobalt_lcd_fbops;
 	info->fix = cobalt_lcdfb_fix;
 	info->fix.smem_start = res->start;
-- 
2.11.0

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[PATCH for v4.9 LTS 01/87] x86/mce/AMD: Make the init code more  robust "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 07/87] ARM: dts: n900: Mark eMMC slot with  no-sdio and no-sd flags "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 10/87] net/mlx4_core: Use-after-free causes a  resource leak in flow-steering detach "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 22/87] openrisc: Add _text symbol to fix ksym  build error "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 42/87] video: fbdev: cobalt_lcdfb: Handle return  NULL error from devm_ioremap "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 20/87] ASoC: nau8825: fix invalid configuration  in Pre-Scalar of FLL "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 51/87] ALSA: usb-audio: test EP_FLAG_RUNNING at  urb completion "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 39/87] tools lib traceevent: Fix prev/next_prio  for deadline tasks "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 33/87] usb: gadget: Fix copy/pasted error message "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 29/87] ARM64: zynqmp: Fix i2c node's compatible  string "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 24/87] dmaengine: ioatdma: workaround SKX ioatdma  version "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 13/87] drm/msm: Ensure that the hardware write  pointer is valid "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 26/87] dmaengine: ti-dma-crossbar: Add some  'of_node_put()' in error path. "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200
  [PATCH for v4.9 LTS 04/87] dt-bindings: power/supply: Update TPS65217  properties "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-07-15 03:50 +0200

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