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vis(3): Avoid arithmetic overflow before calloc(3). 

Prompted by PR lib/57573.

XXX pullup-10
XXX pullup-9
XXX pullup-8
This commit is contained in:
riastradh 2023-08-12 12:47:17 +00:00
parent 0da31b0324
commit 4476814b92
1 changed files with 10 additions and 2 deletions
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12
lib/libc/gen/vis.c
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@ -1,4 +1,4 @@
/* $NetBSD: vis.c,v 1.78 2023/08/12 12:46:50 riastradh Exp $ */
/* $NetBSD: vis.c,v 1.79 2023/08/12 12:47:17 riastradh Exp $ */
/*-
* Copyright (c) 1989, 1993
@ -57,7 +57,7 @@
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: vis.c,v 1.78 2023/08/12 12:46:50 riastradh Exp $");
__RCSID("$NetBSD: vis.c,v 1.79 2023/08/12 12:47:17 riastradh Exp $");
#endif /* LIBC_SCCS and not lint */
#ifdef __FBSDID
__FBSDID("$FreeBSD$");
@ -432,6 +432,14 @@ istrsenvisx(char **mbdstp, size_t *dlen, const char *mbsrc, size_t mblength,
* return to the caller.
*/
/*
* Guarantee the arithmetic on input to calloc won't overflow.
*/
if (mbslength > (SIZE_MAX - 1)/16) {
errno = ENOMEM;
return -1;
}
/* Allocate space for the wide char strings */
psrc = pdst = extra = NULL;
mdst = NULL;