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-rw-r--r--src/unistd/getcwd.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/src/unistd/getcwd.c b/src/unistd/getcwd.c
index 2e540cd4..a7b925d2 100644
--- a/src/unistd/getcwd.c
+++ b/src/unistd/getcwd.c
@@ -7,7 +7,13 @@
 char *getcwd(char *buf, size_t size)
 {
 	char tmp[PATH_MAX];
-	if (!buf) buf = tmp, size = PATH_MAX;
+	if (!buf) {
+		buf = tmp;
+		size = PATH_MAX;
+	} else if (!size) {
+		errno = EINVAL;
+		return 0;
+	}
 	if (syscall(SYS_getcwd, buf, size) < 0) return 0;
 	return buf == tmp ? strdup(buf) : buf;
 }