9os

commit c977a585663c21494c76fbe691b177669172793a
parent 895c6ce13608b721fc8cfd04f4ea8a397d1bc87b
Author: Roberto E. Vargas Caballero <roberto@clue.aero>
Date:   Mon, 12 Aug 2019 14:40:04 +0200

[dev] Check return value of namec()

Namec can return NULL if the path is wrong. Open()
was not checking this condition and it was generating
a segfault when it was accesing it after calling
chan2fd().

Change-Id: Iba3b9f6d9d1ab0526cdab768431cdbb12879cfa3

Diffstat:
M
drivers/dev.c
 | 
3
++-

1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/dev.c b/drivers/dev.c
@@ -375,7 +375,8 @@ open(const char *fname, int mode)
 	if (!validmode(mode))
 		return -1;
 
-	c = namec(fname, mode);
+	if ((c = namec(fname, mode)) == NULL)
+		return -1;
 
 	r = chan2fd(c);
 	unlock(&c->mutex);