A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 02:32:09 -04:00
Code Issues Projects Releases Packages Wiki Activity

sock: fix sendmmsg for partial sendmsg

Browse source 
Do not send the next message in sendmmsg for partial sendmsg
invocations.

sendmmsg assumes that it can continue sending the next message
when the return value of the individual sendmsg invocations
is positive. It results in corrupting the data for TCP,
SCTP, and UNIX streams.

For example, sendmmsg([["abcd"], ["efgh"]]) can result in a stream
of "aefgh" if the first sendmsg invocation sends only the first
byte while the second sendmsg goes through.

Datagram sockets either send the entire datagram or fail, so
this patch affects only sockets of type SOCK_STREAM and
SOCK_SEQPACKET.

Fixes: 228e548e60 ("net: Add sendmmsg socket system call")
Signed-off-by: Soheil Hassas Yeganeh <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: Willem de Bruijn <[email protected]>
Signed-off-by: Neal Cardwell <[email protected]>
Acked-by: Maciej Żenczykowski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Soheil Hassas Yeganeh 2016-11-04 15:36:49 -04:00 • committed by David S. Miller
commit 3023898b7d
1 changed files with 2 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

2
net/socket.c
View file

@ -2038,6 +2038,8 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
if (err)
break;
++datagrams;
if (msg_data_left(&msg_sys))
break;
cond_resched();
}