From: richardweinberger <richard@nod.at>
Date: Fri, 8 Jan 2021 10:07:02 +0000 (+0100)
Subject: fusermount: Check for argv[0] being present (#577)
X-Git-Tag: fuse-3.10.2~6
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=699ab32b5dbaf44d715aa08aa21d1ec62e479d2b;p=qemu-gpiodev%2Flibfuse.git

fusermount: Check for argv[0] being present (#577)

It is perfectly legal to execute a program with argc == 0 and therefore
no argv.
fusermount needs to check for this case, otherwise it will pass a NULL
poiunter to strdup() and cause undefined behavior.
Especially since fusermount is setuid root, we need to extra be careful.

Signed-off-by: Richard Weinberger <richard@nod.at>
---

diff --git a/util/fusermount.c b/util/fusermount.c
index 45e96bc..243d25e 100644
--- a/util/fusermount.c
+++ b/util/fusermount.c
@@ -1270,7 +1270,7 @@ int main(int argc, char *argv[])
 		{"version", no_argument, NULL, 'V'},
 		{0, 0, 0, 0}};
 
-	progname = strdup(argv[0]);
+	progname = strdup(argc > 0 ? argv[0] : "fusermount");
 	if (progname == NULL) {
 		fprintf(stderr, "%s: failed to allocate memory\n", argv[0]);
 		exit(1);