From: Darren Kenny <darren.ke...@oracle.com> It is minimal possibility that the values being used here will overflow. So, change the code to use the safemath function grub_mul() to ensure that doesn't happen.
Fixes: CID 73761 Signed-off-by: Darren Kenny <darren.ke...@oracle.com> Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com> --- grub-core/video/fb/video_fb.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/grub-core/video/fb/video_fb.c b/grub-core/video/fb/video_fb.c index 1c9a138dc..ae6b89f9a 100644 --- a/grub-core/video/fb/video_fb.c +++ b/grub-core/video/fb/video_fb.c @@ -1537,7 +1537,13 @@ doublebuf_pageflipping_init (struct grub_video_mode_info *mode_info, volatile void *page1_ptr) { grub_err_t err; - grub_size_t page_size = mode_info->pitch * mode_info->height; + grub_size_t page_size = 0; + + if (grub_mul (mode_info->pitch, mode_info->height, &page_size)) + { + /* Shouldn't happen, but if it does we've a bug. */ + return GRUB_ERR_BUG; + } framebuffer.offscreen_buffer = grub_malloc (page_size); if (! framebuffer.offscreen_buffer) -- 2.11.0 _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel