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 c1095cdc0fe216d03f889e598f20eff17e2913a6..e8c1743fcc103de9b6c36e3db91e1ceda557b50d 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2149,6 +2149,7 @@ 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;