[PATCH 0/2] fbdev: Fix a NULL pointer dereference in fb_release()

Hello,

This small series contains fixes for two bugs I found in fbmem.c, that may explain a bug reported in the rpi4 [0] when using simplefb and vc4 drivers.

I was not able to reproduce the mentioned bug, but looking at the code I think that it might explain the issue.

I've tested these patches in a rpi4 with both simplefb and vc4 drivers built-in and did not find any regression.

[0]: https://github.com/raspberrypi/linux/issues/5011

Best regards, Javier

Javier Martinez Canillas (2): fbdev: Check in file_fb_info() if the fb_info was already been freed fbdev: Make fb_release() return -ENODEV if fbdev was unregistered

drivers/video/fbdev/core/fbmem.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)