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Message-Id: <20230310161022.108593-1-izbyshev@ispras.ru>
Date: Fri, 10 Mar 2023 19:10:22 +0300
From: Alexey Izbyshev <izbyshev@...ras.ru>
To: musl@...ts.openwall.com
Subject: [PATCH] getopt: fix null pointer arithmetic ub
When an option that requires an argument is the last character of
argv[argc-1], getopt computes argv[argc] + optpos. While optpos
is always zero in this case, adding it to null pointer is still
undefined.
---
src/misc/getopt.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/misc/getopt.c b/src/misc/getopt.c
index c3f66995..af12973a 100644
--- a/src/misc/getopt.c
+++ b/src/misc/getopt.c
@@ -87,7 +87,8 @@ int getopt(int argc, char * const argv[], const char *optstring)
if (optstring[i] == ':') {
optarg = 0;
if (optstring[i+1] != ':' || optpos) {
- optarg = argv[optind++] + optpos;
+ optarg = argv[optind++];
+ if (optarg) optarg += optpos;
optpos = 0;
}
if (optind > argc) {
--
2.39.1
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