From: Liping Zhang <zlpnobody@gmail.com>
Date: Fri, 7 Apr 2017 15:51:06 +0000 (+0800)
Subject: sysctl: don't print negative flag for proc_douintvec
X-Git-Tag: release-20171130_firefly~4^2~100^2^2^2~43
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e8505e6432c2eb7296d9c7724146d1ba1966a040;p=firefly-linux-kernel-4.4.55.git

sysctl: don't print negative flag for proc_douintvec

commit 5380e5644afbba9e3d229c36771134976f05c91e upstream.

I saw some very confusing sysctl output on my system:
  # cat /proc/sys/net/core/xfrm_aevent_rseqth
  -2
  # cat /proc/sys/net/core/xfrm_aevent_etime
  -10
  # cat /proc/sys/net/ipv4/tcp_notsent_lowat
  -4294967295

Because we forget to set the *negp flag in proc_douintvec, so it will
become a garbage value.

Since the value related to proc_douintvec is always an unsigned integer,
so we can set *negp to false explictily to fix this issue.

Fixes: e7d316a02f68 ("sysctl: handle error writing UINT_MAX to u32 fields")
Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Cc: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 464a7864e4c5..5f3a51614ecf 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2070,6 +2070,7 @@ static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
 		*valp = *lvalp;
 	} else {
 		unsigned int val = *valp;
+		*negp = false;
 		*lvalp = (unsigned long)val;
 	}
 	return 0;