This is a note to let you know that I've just added the patch titled
sctp: fix memory leak in sctp_datamsg_from_user() when copy from user space
fails
to the 3.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sctp-fix-memory-leak-in-sctp_datamsg_from_user-when-copy-from-user-space-fails.patch
and it can be found in the queue-3.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 189e72643f2fd31b1a47f2c6f8ba6f25b74e10c0 Mon Sep 17 00:00:00 2001
From: Tommi Rantala <[email protected]>
Date: Tue, 27 Nov 2012 04:01:46 +0000
Subject: sctp: fix memory leak in sctp_datamsg_from_user() when copy from user
space fails
From: Tommi Rantala <[email protected]>
[ Upstream commit be364c8c0f17a3dd42707b5a090b318028538eb9 ]
Trinity (the syscall fuzzer) discovered a memory leak in SCTP,
reproducible e.g. with the sendto() syscall by passing invalid
user space pointer in the second argument:
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
int main(void)
{
int fd;
struct sockaddr_in sa;
fd = socket(AF_INET, SOCK_STREAM, 132 /*IPPROTO_SCTP*/);
if (fd < 0)
return 1;
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = inet_addr("127.0.0.1");
sa.sin_port = htons(11111);
sendto(fd, NULL, 1, 0, (struct sockaddr *)&sa, sizeof(sa));
return 0;
}
As far as I can tell, the leak has been around since ~2003.
Signed-off-by: Tommi Rantala <[email protected]>
Acked-by: Vlad Yasevich <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/sctp/chunk.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -284,7 +284,7 @@ struct sctp_datamsg *sctp_datamsg_from_u
goto errout;
err = sctp_user_addto_chunk(chunk, offset, len, msgh->msg_iov);
if (err < 0)
- goto errout;
+ goto errout_chunk_free;
offset += len;
@@ -324,7 +324,7 @@ struct sctp_datamsg *sctp_datamsg_from_u
__skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
- (__u8 *)chunk->skb->data);
if (err < 0)
- goto errout;
+ goto errout_chunk_free;
sctp_datamsg_assign(msg, chunk);
list_add_tail(&chunk->frag_list, &msg->chunks);
@@ -332,6 +332,9 @@ struct sctp_datamsg *sctp_datamsg_from_u
return msg;
+errout_chunk_free:
+ sctp_chunk_free(chunk);
+
errout:
list_for_each_safe(pos, temp, &msg->chunks) {
list_del_init(pos);
Patches currently in stable-queue which might be from [email protected] are
queue-3.6/tmpfs-fix-shared-mempolicy-leak.patch
queue-3.6/sctp-fix-memory-leak-in-sctp_datamsg_from_user-when-copy-from-user-space-fails.patch
queue-3.6/sctp-fix-enomem-result-with-invalid-user-space-pointer-in-sendto-syscall.patch
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