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
WARNING: multiple messages have this Message-ID (diff)
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: devel@driverdev.osuosl.org, Cengiz Can <cengiz@kernel.wtf>, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org 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 _______________________________________________ devel mailing list devel@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
next reply other threads:[~2020-07-29 13:57 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-29 13:56 Cengiz Can [this message] 2020-07-29 13:56 ` [PATCH] staging: atomisp: move null check to earlier point Cengiz Can 2020-07-29 15:13 ` Andy Shevchenko 2020-07-29 15:13 ` Andy Shevchenko 2020-07-30 8:45 ` Dan Carpenter 2020-07-30 8:45 ` Dan Carpenter 2020-07-30 8:59 ` Cengiz Can 2020-07-30 8:59 ` Cengiz Can 2020-07-30 22:17 ` [PATCH v2] " Cengiz Can 2020-07-30 22:17 ` Cengiz Can 2020-07-31 8:38 ` Andy Shevchenko 2020-07-31 8:38 ` Andy Shevchenko 2020-08-01 21:51 ` [PATCH v3] " Cengiz Can 2020-08-01 21:51 ` Cengiz Can 2020-08-01 21:55 ` [PATCHi v4] " Cengiz Can 2020-08-01 21:55 ` Cengiz Can 2020-08-01 21:58 ` [PATCH v5] " Cengiz Can 2020-08-01 21:58 ` Cengiz Can 2020-08-01 22:01 ` [PATCH v6] " Cengiz Can 2020-08-01 22:01 ` Cengiz Can 2020-08-06 18:34 ` Cengiz Can 2020-08-06 18:34 ` Cengiz Can 2020-08-06 18:39 ` Greg KH 2020-08-06 18:39 ` Greg KH 2020-08-06 20:38 ` Cengiz Can 2020-08-06 20:38 ` Cengiz Can 2020-08-06 22:15 ` [PATCH] " Bjorn Helgaas 2020-08-06 22:15 ` Bjorn Helgaas 2020-08-07 9:53 ` Dan Carpenter 2020-08-07 9:53 ` Dan Carpenter
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