vis-menu: check read(2) return value

Fixes CID 137371

1 files changed, 2 insertions, 1 deletions

diff --git a/vis-menu.c b/vis-menu.c
index a5023e2..1682ed2 100644
--- a/vis-menu.c
+++ b/vis-menu.c
@@ -308,7 +308,8 @@ readstdin() {
 
 static void
 xread(int fd, void *buf, size_t nbyte) {
-	if (read(fd, buf, nbyte) < 0)
+	ssize_t r = read(fd, buf, nbyte);
+	if (r < 0 || (size_t)r != nbyte)
 		die("Can not read.");
 }