From 5380e5644afbba9e3d229c36771134976f05c91e Mon Sep 17 00:00:00 2001 From: Liping Zhang Date: Fri, 7 Apr 2017 23:51:06 +0800 Subject: [PATCH] sysctl: don't print negative flag for proc_douintvec 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 Cc: Subash Abhinov Kasiviswanathan Cc: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/sysctl.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sysctl.c b/kernel/sysctl.c index acf0a5a06da7..8cca4c7bb21f 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2136,6 +2136,7 @@ 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;