From: Cengiz Can <cengiz@kernel.wtf>
To: Mauro Carvalho Chehab <mchehab@kernel.org>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: linux-media@vger.kernel.org, devel@driverdev.osuosl.org,
linux-kernel@vger.kernel.org, Cengiz Can <cengiz@kernel.wtf>
Subject: [PATCH] staging: atomisp: move null check to earlier point
Date: Wed, 29 Jul 2020 16:56:37 +0300 [thread overview]
Message-ID: <20200729135636.9220-1-cengiz@kernel.wtf> (raw)
`find_gmin_subdev` function 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. ie:
```
/* Acquired here --------v */
struct gmin_subdev *gs = find_gmin_subdev(subdev);
int ret;
int value;
/* v------Dereferenced here */
if (gs->v2p8_gpio >= 0) {
pr_info("atomisp_gmin_platform: 2.8v power on GPIO %d\n",
gs->v2p8_gpio);
ret = gpio_request(gs->v2p8_gpio, "camera_v2p8");
if (!ret)
ret = gpio_direction_output(gs->v2p8_gpio, 0);
if (ret)
pr_err("V2P8 GPIO initialization failed\n");
}
```
I have moved the NULL check before deref point.
Caught-by: Coverity Static Analyzer CID 1465536
Signed-off-by: Cengiz Can <cengiz@kernel.wtf>
---
drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
index 0df46a1af5f0..8e9c5016f299 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
@@ -871,6 +871,11 @@ static int gmin_v2p8_ctrl(struct v4l2_subdev *subdev, int on)
int ret;
int value;
+ if (!gs) {
+ pr_err("Unable to find gmin subdevice\n");
+ return -EINVAL;
+ }
+
if (gs->v2p8_gpio >= 0) {
pr_info("atomisp_gmin_platform: 2.8v power on GPIO %d\n",
gs->v2p8_gpio);
@@ -881,7 +886,7 @@ 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;
--
2.27.0
next reply other threads:[~2020-07-29 13:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-29 13:56 Cengiz Can [this message]
2020-07-29 15:13 ` [PATCH] staging: atomisp: move null check to earlier point Andy Shevchenko
2020-07-30 8:45 ` Dan Carpenter
2020-07-30 8:59 ` Cengiz Can
2020-07-30 22:17 ` [PATCH v2] " Cengiz Can
2020-07-31 8:38 ` Andy Shevchenko
2020-08-01 21:51 ` [PATCH v3] " Cengiz Can
2020-08-01 21:55 ` [PATCHi v4] " Cengiz Can
2020-08-01 21:58 ` [PATCH v5] " Cengiz Can
2020-08-01 22:01 ` [PATCH v6] " Cengiz Can
2020-08-06 18:34 ` Cengiz Can
2020-08-06 18:39 ` Greg KH
2020-08-06 20:38 ` Cengiz Can
2020-08-06 22:15 ` [PATCH] " Bjorn Helgaas
2020-08-07 9:53 ` Dan Carpenter
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