| Message ID | 20211220081132.883709-1-jiasheng@iscas.ac.cn (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] video: fbdev: Check for null res pointer | expand |
Hi Jiasheng, On Mon, Dec 20, 2021 at 9:19 AM Jiasheng Jiang <jiasheng@iscas.ac.cn> wrote: > The return value of platform_get_resource() needs to be checked. > To avoid use of error pointer in case that there is no suitable resource. Thanks for your patch! > Fixes: f7018c213502 ("video: move fbdev to drivers/video/fbdev") That can't be the real introducer of the "bug"... > Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> > --- a/drivers/video/fbdev/imxfb.c > +++ b/drivers/video/fbdev/imxfb.c > @@ -1083,6 +1083,8 @@ static int imxfb_remove(struct platform_device *pdev) > struct resource *res; > > res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!res) > + return -EINVAL; This cannot happen, as imxfb_remove() can only be called if imxfb_probe() succeeded. imxfb_probe() does check the result of platform_get_resource(), and fails if the resource was not found. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
diff --git a/drivers/video/fbdev/imxfb.c b/drivers/video/fbdev/imxfb.c index ad598257ab38..68288756ffff 100644 --- a/drivers/video/fbdev/imxfb.c +++ b/drivers/video/fbdev/imxfb.c @@ -1083,6 +1083,8 @@ static int imxfb_remove(struct platform_device *pdev) struct resource *res; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; imxfb_disable_controller(fbi);
The return value of platform_get_resource() needs to be checked. To avoid use of error pointer in case that there is no suitable resource. Fixes: f7018c213502 ("video: move fbdev to drivers/video/fbdev") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> --- Changelog: v1 -> v2 *Change 1. Correct the commit message. --- drivers/video/fbdev/imxfb.c | 2 ++ 1 file changed, 2 insertions(+)