On Thu, Jan 05, 2023 at 11:20:38AM -0800, Kees Cook wrote: > Zero-length arrays are deprecated[1]. Replace struct aperture's "ranges" > 0-length array with a flexible array. (How is the size of this array > verified?) Detected with GCC 13, using -fstrict-flex-arrays=3: > > samples/vfio-mdev/mdpy-fb.c: In function 'mdpy_fb_probe': > samples/vfio-mdev/mdpy-fb.c:169:32: warning: array subscript 0 is outside array bounds of 'struct aperture[0]' [-Warray-bounds=] > 169 | info->apertures->ranges[0].base = info->fix.smem_start; > | ~~~~~~~~~~~~~~~~~~~~~~~^~~ > In file included from samples/vfio-mdev/mdpy-fb.c:21: > include/linux/fb.h:510:19: note: while referencing 'ranges' > 510 | } ranges[0]; > | ^~~~~~ > > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays > > Cc: Helge Deller <deller@xxxxxx> > Cc: "Gustavo A. R. Silva" <gustavoars@xxxxxxxxxx> > Cc: linux-fbdev@xxxxxxxxxxxxxxx > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> Thanks! -- Gustavo > --- > include/linux/fb.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/fb.h b/include/linux/fb.h > index 96b96323e9cb..bf59d6a3590f 100644 > --- a/include/linux/fb.h > +++ b/include/linux/fb.h > @@ -507,7 +507,7 @@ struct fb_info { > struct aperture { > resource_size_t base; > resource_size_t size; > - } ranges[0]; > + } ranges[]; > } *apertures; > > bool skip_vt_switch; /* no VT switch on suspend/resume required */ > -- > 2.34.1 >
