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authorAl Viro <viro@zeniv.linux.org.uk>2012-08-18 00:25:51 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-09-26 21:08:50 -0400
commit56b31d1c9f1e6a3ad92e7bfe252721e05d92b285 (patch)
tree44521dbcdf51695b6092f2a4dabe83f460c2ed7c /net/sctp/socket.c
parent28407630513b1a86133db0ef8b39fabad6c494af (diff)
downloadlinux-56b31d1c9f1e6a3ad92e7bfe252721e05d92b285.tar.bz2
unexport sock_map_fd(), switch to sock_alloc_file()
Both modular callers of sock_map_fd() had been buggy; sctp one leaks descriptor and file if copy_to_user() fails, 9p one shouldn't be exposing file in the descriptor table at all. Switch both to sock_alloc_file(), export it, unexport sock_map_fd() and make it static. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'net/sctp/socket.c')
-rw-r--r--net/sctp/socket.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 5e259817a7f3..fb5931ca50d0 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -70,6 +70,7 @@
#include <linux/init.h>
#include <linux/crypto.h>
#include <linux/slab.h>
+#include <linux/file.h>
#include <net/ip.h>
#include <net/icmp.h>
@@ -4276,6 +4277,7 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
{
sctp_peeloff_arg_t peeloff;
struct socket *newsock;
+ struct file *newfile;
int retval = 0;
if (len < sizeof(sctp_peeloff_arg_t))
@@ -4289,22 +4291,35 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
goto out;
/* Map the socket to an unused fd that can be returned to the user. */
- retval = sock_map_fd(newsock, 0);
+ retval = get_unused_fd();
if (retval < 0) {
sock_release(newsock);
goto out;
}
+ newfile = sock_alloc_file(newsock, 0);
+ if (unlikely(IS_ERR(newfile))) {
+ put_unused_fd(retval);
+ sock_release(newsock);
+ return PTR_ERR(newfile);
+ }
+
SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
__func__, sk, newsock->sk, retval);
/* Return the fd mapped to the new socket. */
+ if (put_user(len, optlen)) {
+ fput(newfile);
+ put_unused_fd(retval);
+ return -EFAULT;
+ }
peeloff.sd = retval;
- if (put_user(len, optlen))
+ if (copy_to_user(optval, &peeloff, len)) {
+ fput(newfile);
+ put_unused_fd(retval);
return -EFAULT;
- if (copy_to_user(optval, &peeloff, len))
- retval = -EFAULT;
-
+ }
+ fd_install(retval, newfile);
out:
return retval;
}