From: Forty-Bot <Forty-Bot@users.noreply.github.com>
Date: Mon, 25 Feb 2019 21:06:42 +0000 (-0500)
Subject: hello_ll: Fix null pointer dereference (#363)
X-Git-Tag: fuse-3.4.2~10
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1cce958bb64c65228d74abcf4a444863d291734b;p=qemu-gpiodev%2Flibfuse.git

hello_ll: Fix null pointer dereference (#363)

If hello_ll is invoked without a mountpoint, it will try to call
fuse_session_mount anyway with the NULL mountpoint (which then causes a
segfault). Print out a short help message instead (taken from
passthrough_ll.c).
---

diff --git a/example/hello_ll.c b/example/hello_ll.c
index 601cf93..97f3c50 100644
--- a/example/hello_ll.c
+++ b/example/hello_ll.c
@@ -183,6 +183,13 @@ int main(int argc, char *argv[])
 		goto err_out1;
 	}
 
+	if(opts.mountpoint == NULL) {
+		printf("usage: %s [options] <mountpoint>\n", argv[0]);
+		printf("       %s --help\n", argv[0]);
+		ret = 1;
+		goto err_out1;
+	}
+
 	se = fuse_session_new(&args, &hello_ll_oper,
 			      sizeof(hello_ll_oper), NULL);
 	if (se == NULL)