[PATCH] media: radio-sf16fmr2: unregister v4l2 device on tuner init failure

[PATCH] media: radio-sf16fmr2: unregister v4l2 device on tuner init failure

[Myeonghun Pak]

When snd_tea575x_init() fails, fmr2_probe() releases the I/O region
but leaves its v4l2_device registered. Unregister it before returning
to the caller, which frees the containing fmr2 allocation.

This issue was identified during our ongoing static-analysis research
while reviewing kernel code.

Fixes: d4ecc83b79cc ("[media] tea575x-tuner: update to latest V4L2 framework requirements")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Co-developed-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
---
diff --git a/drivers/media/radio/radio-sf16fmr2.c b/drivers/media/radio/radio-sf16fmr2.c
--- a/drivers/media/radio/radio-sf16fmr2.c
+++ b/drivers/media/radio/radio-sf16fmr2.c
@@ -241,6 +241,7 @@
 
 	if (snd_tea575x_init(&fmr2->tea, THIS_MODULE)) {
 		printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
+		v4l2_device_unregister(&fmr2->v4l2_dev);
 		release_region(fmr2->io, 2);
 		return -ENODEV;
 	}