diff options
| author | Liping Zhang <zlpnobody@gmail.com> | 2017-04-07 23:51:07 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-15 11:57:46 +0200 |
| commit | a2148222e3751fe2e02c71533dced8f030e94295 (patch) | |
| tree | cd2106a05a6e6bd7ba605d624107bae2ea4f9c8e | |
| parent | e8505e6432c2eb7296d9c7724146d1ba1966a040 (diff) | |
sysctl: report EINVAL if value is larger than UINT_MAX for proc_douintvec
commit 425fffd886bae3d127a08fa6a17f2e31e24ed7ff upstream.
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 <zlpnobody@gmail.com>
Cc: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/sysctl.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 5f3a51614ecf..002ec084124b 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2067,6 +2067,8 @@ 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; |