bhyvegc_resize: make use of reallocarray(3) for bounds-checking.

Also add __FBSDID.

Reviewed by:	grehan

This file lacks a license(!) so for this change the following declaration
applies:

To the greatest extent permitted by, but not in contravention of,
applicable law, Affirmer hereby overtly, fully, permanently, irrevocably
and unconditionally waives, abandons, and surrenders all of Affirmer's
Copyright and Related Rights and associated claims and causes of action,
whether now known or unknown (including existing as well as future claims
and causes of action).

1 files changed, 6 insertions, 3 deletions

diff --git a/usr.sbin/bhyve/bhyvegc.c b/usr.sbin/bhyve/bhyvegc.c
index 377b05b0878f..0987e39dbb6b 100644
--- a/usr.sbin/bhyve/bhyvegc.c
+++ b/usr.sbin/bhyve/bhyvegc.c
@@ -1,4 +1,5 @@
 #include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
 
@@ -56,9 +57,11 @@ bhyvegc_resize(struct bhyvegc *gc, int width, int height)
 	gc_image->width = width;
 	gc_image->height = height;
 	if (!gc->raw) {
-		gc_image->data = realloc(gc_image->data,
-		    sizeof (uint32_t) * width * height);
-		memset(gc_image->data, 0, width * height * sizeof (uint32_t));
+		gc_image->data = reallocarray(gc_image->data, width * height,
+		    sizeof (uint32_t));
+		if (gc_image->data != NULL)
+			memset(gc_image->data, 0, width * height *
+			    sizeof (uint32_t));
 	}
 }