mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-03 11:12:01 -04:00
Code Issues Packages Projects Releases Wiki Activity

media: atomisp: move null check to earlier point

Browse Source 
`find_gmin_subdev()` that returns a pointer to `struct
gmin_subdev` can return NULL.

In `gmin_v2p8_ctrl()` there's a call to this function but the
possibility of a NULL was not checked before its being dereferenced,
i.e.:

  /* Acquired here --------v */
  struct gmin_subdev *gs = find_gmin_subdev(subdev);

  /*  v------Dereferenced here */
  if (gs->v2p8_gpio >= 0) {
      ...
  }

With this change we're null checking `find_gmin_subdev()` result
and we return an error if that's the case. We also WARN()
for the sake of debugging.

Signed-off-by: Cengiz Can <cengiz@kernel.wtf>
Reported-by: Coverity Static Analyzer CID 1465536
Suggested-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Cengiz Can
2020-08-02 00:01:02 +02:00
committed by Mauro Carvalho Chehab
parent 8d1fdaa50c
commit 9b734bb9e7
1 changed files with 4 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
View File

@@ -871,6 +871,9 @@ static int gmin_v2p8_ctrl(struct v4l2_subdev *subdev, int on)
int ret;
int value;
if (WARN_ON(!gs))
return -ENODEV;
if (gs->v2p8_gpio >= 0) {
pr_info("atomisp_gmin_platform: 2.8v power on GPIO %d\n",
gs->v2p8_gpio);
@@ -881,7 +884,7 @@ static int gmin_v2p8_ctrl(struct v4l2_subdev *subdev, int on)
pr_err("V2P8 GPIO initialization failed\n");
}
if (!gs || gs->v2p8_on == on)
if (gs->v2p8_on == on)
return 0;
gs->v2p8_on = on;