diff options
| author | Tommi Rantala <tt.rantala@gmail.com> | 2012-11-27 04:01:46 +0000 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2013-06-10 11:43:34 +0200 |
| commit | 5e4b9c85cc21931ed6543cd8b527fd34ceb40717 (patch) | |
| tree | 95f0fdcc565c58ab7176b473c15764d5a79446e6 | |
| parent | 0e03cad4fb451922fb5371ddec1919b491ad2b08 (diff) | |
sctp: fix memory leak in sctp_datamsg_from_user() when copy from user space fails
[ 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 <tt.rantala@gmail.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | net/sctp/chunk.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c index acf7c4d128f7..b29621ddee0b 100644 --- a/net/sctp/chunk.c +++ b/net/sctp/chunk.c @@ -272,7 +272,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc, goto errout; err = sctp_user_addto_chunk(chunk, offset, len, msgh->msg_iov); if (err < 0) - goto errout; + goto errout_chunk_free; offset += len; @@ -308,7 +308,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc, __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); @@ -316,6 +316,9 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc, return msg; +errout_chunk_free: + sctp_chunk_free(chunk); + errout: list_for_each_safe(pos, temp, &msg->chunks) { list_del_init(pos); |