bin/xbps-pkgdb: handle oom in alternative path creation

Author: Duncaen

bin/xbps-pkgdb/check_pkg_alternatives.c

@@ -86,6 +86,8 @@ relpath(char *from, char *to)
 	for (up = -1, from--; from && *from; from = strchr(from + 1, '/'), up++);
 
 	rel = calloc(1, 3 * up + strlen(p) + 1);
+	if (!rel)
+		return NULL;
 
 	while (up--)
 		strcat(rel, "../");
@@ -126,6 +128,8 @@ check_symlinks(struct xbps_handle *xhp, const char *pkgname, xbps_array_t a,
 
 		if (target[0] == '/') {
 			p = relpath(linkpath + strlen(xhp->rootdir), target);
+			if (!p)
+				return xbps_error_oom();
 			free(target);
 			target = p;
 		}