From 76e379754ba618989f6215be608d5c04774a611d Mon Sep 17 00:00:00 2001 From: Uday Khare Date: Mon, 6 Jul 2026 20:58:33 +0530 Subject: [PATCH] media: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure kthread_run() returns an ERR_PTR on failure, not NULL. When start_streaming() fails, data->kthread_vid_cap is left holding this error pointer instead of being cleared. This causes two subsequent bugs: 1. A future call to start_streaming() sees a non-NULL kthread_vid_cap and returns 0 (success) immediately, without actually starting the capture thread. 2. A call to stop_streaming() checks 'kthread_vid_cap == NULL' which is false for an error pointer, and proceeds to call kthread_stop() on the error pointer, leading to a kernel crash. Fix this by resetting kthread_vid_cap to NULL on failure before jumping to the error path. Fixes: 5cebaac60974 ("media: video-i2c: add video-i2c driver") Cc: stable@vger.kernel.org Signed-off-by: Uday Khare Signed-off-by: Hans Verkuil --- drivers/media/i2c/video-i2c.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c index 56b99eea54a1..7f971645c0b5 100644 --- a/drivers/media/i2c/video-i2c.c +++ b/drivers/media/i2c/video-i2c.c @@ -523,8 +523,12 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count) data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data, "%s-vid-cap", data->v4l2_dev.name); ret = PTR_ERR_OR_ZERO(data->kthread_vid_cap); - if (!ret) - return 0; + if (ret) { + data->kthread_vid_cap = NULL; + goto error_rpm_put; + } + + return 0; error_rpm_put: pm_runtime_put_autosuspend(dev);