commit: 98382f419f32d2c12d021943b87dea555677144b
From: Anton Blanchard <an...@samba.org>
Date: Thu, 4 Aug 2011 14:07:39 +0000
Subject: [PATCH] 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 <an...@samba.org>
Cc: stable <sta...@kernel.org> [3.0+]
Signed-off-by: David S. Miller <da...@davemloft.net>
---
net/socket.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/net/socket.c b/net/socket.c
index e4ed235..b5c6de4 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1999,6 +1999,9 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
unsigned int vlen,
struct compat_mmsghdr __user *compat_entry;
struct msghdr msg_sys;
+ if (vlen > UIO_MAXIOV)
+ vlen = UIO_MAXIOV;
+
datagrams = 0;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
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