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net: Cap number of elements for sendmmsg 

To limit the amount of time we can spend in sendmmsg, cap the
number of elements to UIO_MAXIOV (currently 1024).

For error handling an application using sendmmsg needs to retry at
the first unsent message, so capping is simpler and requires less
application logic than returning EINVAL.

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: stable <stable@kernel.org> [3.0+]
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anton Blanchard 2011-08-04 14:07:39 +00:00 committed by David S. Miller
parent 728ffb86f1
commit 98382f419f
1 changed files with 3 additions and 0 deletions
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3
net/socket.c
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@ -1999,6 +1999,9 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
struct compat_mmsghdr __user *compat_entry; struct compat_mmsghdr __user *compat_entry;
struct msghdr msg_sys; struct msghdr msg_sys;
if (vlen > UIO_MAXIOV)
vlen = UIO_MAXIOV;
datagrams = 0; datagrams = 0;
sock = sockfd_lookup_light(fd, &err, &fput_needed); sock = sockfd_lookup_light(fd, &err, &fput_needed);