Patch "sysctl: don't print negative flag for proc_douintvec" has been added to the 4.9-stable tree

Patch "sysctl: don't print negative flag for proc_douintvec" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    sysctl: don't print negative flag for proc_douintvec

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     sysctl-don-t-print-negative-flag-for-proc_douintvec.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 5380e5644afbba9e3d229c36771134976f05c91e Mon Sep 17 00:00:00 2001
From: Liping Zhang <zlpnobody@gmail.com>
Date: Fri, 7 Apr 2017 23:51:06 +0800
Subject: sysctl: don't print negative flag for proc_douintvec

From: Liping Zhang <zlpnobody@gmail.com>

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>

---
 kernel/sysctl.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2149,6 +2149,7 @@ static int do_proc_douintvec_conv(bool *
 		*valp = *lvalp;
 	} else {
 		unsigned int val = *valp;
+		*negp = false;
 		*lvalp = (unsigned long)val;
 	}
 	return 0;


Patches currently in stable-queue which might be from zlpnobody@gmail.com are

queue-4.9/sysctl-don-t-print-negative-flag-for-proc_douintvec.patch
queue-4.9/sysctl-report-einval-if-value-is-larger-than-uint_max-for-proc_douintvec.patch