utils-std

commit: 437351928c485ffd3485fc1958bf9a7067150bc3
parent 89079e2ff003563e8b1a63a8c6233b115ff5b05b
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Mon, 23 Sep 2024 05:23:04 +0200

cmd/printf: check against overflow prior to calloc

Diffstat:
M
cmd/printf.c
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/cmd/printf.c b/cmd/printf.c
@@ -38,6 +38,7 @@
 
 #define _POSIX_C_SOURCE 200809L
 
+#include <assert.h>
 #include <ctype.h>
 #include <err.h>
 #include <errno.h>
@@ -496,7 +497,8 @@ mknum(char *str, char ch)
 	len = strlen(str) + 2;
 	if(len > copy_size)
 	{
-		newlen = ((len + 1023) >> 10) << 10;
+		newlen = len + 1023;
+		assert(newlen != 0);
 		if((newcopy = realloc(copy, newlen)) == NULL)
 		{
 			warnx("warning: %s", strerror(ENOMEM));