From: Dan Carpenter <dan.carpenter@oracle.com> mainline inclusion from mainline-5.10-rc4 commit d435c05ab0197ee302290e1cee3f2d9c9024a64f category: bugfix bugzilla: 51817 CVE: NA ------------------------------------------------- You can't write to this file because the permissions are 0444. But it sort of looked like you could do a write and it would result in a read. Then it looked like proc_sys_call_handler() just ignored it. Which is confusing. It's more clear if the "write" just returns zero. Also, the "lenp" pointer is never NULL so that check can be removed. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> (cherry picked from commit d435c05ab0197ee302290e1cee3f2d9c9024a64f) Signed-off-by: Baisong Zhong <zhongbaisong@huawei.com> Reviewed-by: Yue Haibing <yuehaibing@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- net/sunrpc/sysctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/sunrpc/sysctl.c b/net/sunrpc/sysctl.c index c39b90ac24020..dee2983ecfd00 100644 --- a/net/sunrpc/sysctl.c +++ b/net/sunrpc/sysctl.c @@ -64,7 +64,7 @@ static int proc_do_xprt(struct ctl_table *table, int write, char tmpbuf[256]; size_t len; - if ((*ppos && !write) || !*lenp) { + if (write || *ppos) { *lenp = 0; return 0; } -- 2.25.1