From 5b23136bcf766a58160a319677b366c90f0cd223 Mon Sep 17 00:00:00 2001 From: Jean-Mickael Guerin Date: Tue, 1 Dec 2009 07:52:16 +0000 Subject: [PATCH] net: compat_sys_recvmmsg user timespec arg can be NULL We must test if user timespec is non-NULL before copying from userpace, same as sys_recvmmsg(). Commiter note: changed it so that we have just one branch. Signed-off-by: Jean-Mickael Guerin Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- net/compat.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/net/compat.c b/net/compat.c index 6a2f75fb3f4..e1a56ade803 100644 --- a/net/compat.c +++ b/net/compat.c @@ -758,9 +758,13 @@ asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg, { int datagrams; struct timespec ktspec; - struct compat_timespec __user *utspec = - (struct compat_timespec __user *)timeout; + struct compat_timespec __user *utspec; + if (timeout == NULL) + return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, + flags | MSG_CMSG_COMPAT, NULL); + + utspec = (struct compat_timespec __user *)timeout; if (get_user(ktspec.tv_sec, &utspec->tv_sec) || get_user(ktspec.tv_nsec, &utspec->tv_nsec)) return -EFAULT; -- 2.20.1