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sysctl: don't print negative flag for proc_douintvec

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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>
This commit is contained in:
Liping Zhang 2017-04-07 23:51:06 +08:00 committed by Greg Kroah-Hartman
parent 4e84b9c790
commit 3a20c57b43
1 changed files with 1 additions and 0 deletions
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kernel/sysctl.c
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@ -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;