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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-08-18 00:25:51 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-09-26 21:08:50 -0400 |
| commit | 56b31d1c9f1e6a3ad92e7bfe252721e05d92b285 (patch) | |
| tree | 44521dbcdf51695b6092f2a4dabe83f460c2ed7c /net/sctp/socket.c | |
| parent | 28407630513b1a86133db0ef8b39fabad6c494af (diff) | |
| download | linux-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.c | 25 |
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; } |