diff options
author | Tommi Rantala <tt.rantala@gmail.com> | 2012-11-27 08:01:46 +0400 |
---|---|---|
committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2014-02-11 01:10:51 +0400 |
commit | eb8896864a982080bb25627bdabcfce8561adce4 (patch) | |
tree | f75f04a09e697b9c28667d88b107de7b6cac6e59 | |
parent | 051c3342813e7bda856fc43534e29c9023c648fc (diff) | |
download | linux-eb8896864a982080bb25627bdabcfce8561adce4.tar.xz |
sctp: fix memory leak in sctp_datamsg_from_user() when copy from user space fails
commit be364c8c0f17a3dd42707b5a090b318028538eb9 upstream.
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: Paul Gortmaker <paul.gortmaker@windriver.com>
-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 3eab6db59a37..df773fcaaa03 100644 --- a/net/sctp/chunk.c +++ b/net/sctp/chunk.c @@ -282,7 +282,7 @@ 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; @@ -322,7 +322,7 @@ 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); @@ -330,6 +330,9 @@ 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); |