From 425fffd886bae3d127a08fa6a17f2e31e24ed7ff Mon Sep 17 00:00:00 2001 From: Liping Zhang Date: Fri, 7 Apr 2017 23:51:07 +0800 Subject: [PATCH] sysctl: report EINVAL if value is larger than UINT_MAX for proc_douintvec Currently, inputting the following command will succeed but actually the value will be truncated: # echo 0x12ffffffff > /proc/sys/net/ipv4/tcp_notsent_lowat This is not friendly to the user, so instead, we should report error when the value is larger than UINT_MAX. Fixes: e7d316a02f68 ("sysctl: handle error writing UINT_MAX to u32 fields") Signed-off-by: Liping Zhang Cc: Subash Abhinov Kasiviswanathan Cc: Andrew Morton Cc: Eric W. Biederman Signed-off-by: Linus Torvalds --- kernel/sysctl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 8cca4c7bb21f..8c8714fcb53c 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2133,6 +2133,8 @@ static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp, if (write) { if (*negp) return -EINVAL; + if (*lvalp > UINT_MAX) + return -EINVAL; *valp = *lvalp; } else { unsigned int val = *valp; -- 2.20.1