From 7ee66e9aec520afa1138876074b815295b6d1821 Mon Sep 17 00:00:00 2001
From: Elliott Hughes <enh@google.com>
Date: Mon, 7 Jun 2021 17:41:22 -0700
Subject: dmesg.c: fix off-by-one.
---
toys/lsb/dmesg.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
(limited to 'toys/lsb')
diff --git a/toys/lsb/dmesg.c b/toys/lsb/dmesg.c
index 829fcd54..8736a8e5 100644
--- a/toys/lsb/dmesg.c
+++ b/toys/lsb/dmesg.c
@@ -141,7 +141,7 @@ void dmesg_main(void)
for (;;) {
// why does /dev/kmesg return EPIPE instead of EAGAIN if oldest message
// expires as we read it?
- if (-1==(len = read(fd, msg, sizeof(msg))) && errno==EPIPE) continue;
+ if (-1==(len = read(fd, msg, sizeof(msg)-1)) && errno==EPIPE) continue;
// read() from kmsg always fails on a pre-3.5 kernel.
if (len==-1 && errno==EINVAL) goto klogctl_mode;
if (len<1) break;
--
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