linux-kernel - [PATCH] [v2] media: atomisp: ssh_css: Fix a null-pointer dereference in load_video

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Date: Thu, 18 Jan 2024 23:13:00 +0800
From: Zhipeng Lu <alexious@....edu.cn>
To: alexious@....edu.cn
Cc: Hans de Goede <hdegoede@...hat.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kate Hsuan <hpa@...hat.com>,
	Dan Carpenter <error27@...il.com>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Brent Pappas <bpappas@...pasbrent.com>,
	Alan Cox <alan@...ux.intel.com>,
	linux-media@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] media: atomisp: ssh_css: Fix a null-pointer dereference in load_video_binaries

The allocation failure of mycs->yuv_scaler_binary in load_video_binaries
is followed with a dereference of mycs->yuv_scaler_binary after the
following call chain:

sh_css_pipe_load_binaries
  |-> load_video_binaries (mycs->yuv_scaler_binary == NULL)
  |
  |-> sh_css_pipe_unload_binaries
        |-> unload_video_binaries

In unload_video_binaries, it calls to ia_css_binary_unload with argument
&pipe->pipe_settings.video.yuv_scaler_binary[i], which refers to the
same memory slot as mycs->yuv_scaler_binary. Thus, a null-pointer
dereference is triggered.

Fixes: a49d25364dfb ("staging/atomisp: Add support for the Intel IPU v2")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
---
Changelog:

v2: change fix approach to set mycs->num_yuv_scaler = 0 in
load_video_binaries. Change the fix tag to correct commit.
---
 drivers/staging/media/atomisp/pci/sh_css.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/media/atomisp/pci/sh_css.c b/drivers/staging/media/atomisp/pci/sh_css.c
index f35c90809414..638f08b3f21b 100644
--- a/drivers/staging/media/atomisp/pci/sh_css.c
+++ b/drivers/staging/media/atomisp/pci/sh_css.c
@@ -4719,6 +4719,7 @@ static int load_video_binaries(struct ia_css_pipe *pipe)
 						  sizeof(struct ia_css_binary),
 						  GFP_KERNEL);
 		if (!mycs->yuv_scaler_binary) {
+			mycs->num_yuv_scaler = 0;
 			err = -ENOMEM;
 			return err;
 		}
-- 
2.34.1