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authorLiping Zhang <zlpnobody@gmail.com>2017-04-07 23:51:07 +0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-04-08 10:27:40 -0700
commit425fffd886bae3d127a08fa6a17f2e31e24ed7ff (patch)
tree7daa21454af6e1a533b6bfc4ba9015b09612b8e6 /kernel
parent8b65bb57d87a66cd156f856f28f2bd72d7b2395e (diff)
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 <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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sysctl.c2
1 files changed, 2 insertions, 0 deletions
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;