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> --- 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