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net: compat_sys_recvmmsg user timespec arg can be NULL

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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 <jean-mickael.guerin@6wind.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jean-Mickael Guerin 2009-12-01 07:52:16 +00:00 committed by David S. Miller
parent d7256d0eb4
commit 5b23136bcf
1 changed files with 6 additions and 2 deletions
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8
net/compat.c
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@ -758,9 +758,13 @@ asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
{ {
int datagrams; int datagrams;
struct timespec ktspec; struct timespec ktspec;
struct compat_timespec __user *utspec = struct compat_timespec __user *utspec;
(struct compat_timespec __user *)timeout;
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) || if (get_user(ktspec.tv_sec, &utspec->tv_sec) ||
get_user(ktspec.tv_nsec, &utspec->tv_nsec)) get_user(ktspec.tv_nsec, &utspec->tv_nsec))
return -EFAULT; return -EFAULT;