Convert SCO socket's getsockopt implementation to use the new getsockopt_iter callback with sockopt_t.
Key changes: - Replace (char __user *optval, int __user *optlen) with sockopt_t *opt - Use opt->optlen for buffer length (input) and returned size (output) - Use copy_to_iter() instead of put_user()/copy_to_user() - Drop the open-coded ptr cursor in BT_CODEC; iter_out advances on every copy_to_iter() naturally - Add linux/uio.h for copy_to_iter() Signed-off-by: Breno Leitao <[email protected]> --- net/bluetooth/sco.c | 59 ++++++++++++++++++++++++++++------------------------- 1 file changed, 31 insertions(+), 28 deletions(-) diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index eba44525d41d9..37dcba9edfab6 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -28,6 +28,7 @@ #include <linux/debugfs.h> #include <linux/seq_file.h> #include <linux/sched/signal.h> +#include <linux/uio.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> @@ -1072,7 +1073,7 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname, } static int sco_sock_getsockopt_old(struct socket *sock, int optname, - char __user *optval, int __user *optlen) + sockopt_t *opt) { struct sock *sk = sock->sk; struct sco_options opts; @@ -1082,8 +1083,7 @@ static int sco_sock_getsockopt_old(struct socket *sock, int optname, BT_DBG("sk %p", sk); - if (get_user(len, optlen)) - return -EFAULT; + len = opt->optlen; lock_sock(sk); @@ -1101,7 +1101,7 @@ static int sco_sock_getsockopt_old(struct socket *sock, int optname, BT_DBG("mtu %u", opts.mtu); len = min(len, sizeof(opts)); - if (copy_to_user(optval, (char *)&opts, len)) + if (copy_to_iter(&opts, len, &opt->iter_out) != len) err = -EFAULT; break; @@ -1119,7 +1119,7 @@ static int sco_sock_getsockopt_old(struct socket *sock, int optname, memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3); len = min(len, sizeof(cinfo)); - if (copy_to_user(optval, (char *)&cinfo, len)) + if (copy_to_iter(&cinfo, len, &opt->iter_out) != len) err = -EFAULT; break; @@ -1134,15 +1134,15 @@ static int sco_sock_getsockopt_old(struct socket *sock, int optname, } static int sco_sock_getsockopt(struct socket *sock, int level, int optname, - char __user *optval, int __user *optlen) + sockopt_t *opt) { struct sock *sk = sock->sk; - int len, err = 0; + int len, val, err = 0; struct bt_voice voice; u32 phys; int buf_len; struct codec_list *c; - u8 num_codecs, i, __user *ptr; + u8 num_codecs, i; struct hci_dev *hdev; struct hci_codec_caps *caps; struct bt_codec codec; @@ -1150,10 +1150,9 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, BT_DBG("sk %p", sk); if (level == SOL_SCO) - return sco_sock_getsockopt_old(sock, optname, optval, optlen); + return sco_sock_getsockopt_old(sock, optname, opt); - if (get_user(len, optlen)) - return -EFAULT; + len = opt->optlen; lock_sock(sk); @@ -1165,8 +1164,9 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, break; } - if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags), - (u32 __user *)optval)) + val = test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); + if (copy_to_iter(&val, sizeof(val), &opt->iter_out) != + sizeof(val)) err = -EFAULT; break; @@ -1175,7 +1175,7 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, voice.setting = sco_pi(sk)->setting; len = min_t(unsigned int, len, sizeof(voice)); - if (copy_to_user(optval, (char *)&voice, len)) + if (copy_to_iter(&voice, len, &opt->iter_out) != len) err = -EFAULT; break; @@ -1188,13 +1188,15 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, phys = hci_conn_get_phy(sco_pi(sk)->conn->hcon); - if (put_user(phys, (u32 __user *) optval)) + if (copy_to_iter(&phys, sizeof(phys), &opt->iter_out) != + sizeof(phys)) err = -EFAULT; break; case BT_PKT_STATUS: - if (put_user(test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags), - (int __user *)optval)) + val = test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags); + if (copy_to_iter(&val, sizeof(val), &opt->iter_out) != + sizeof(val)) err = -EFAULT; break; @@ -1205,7 +1207,9 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, break; } - if (put_user(sco_pi(sk)->conn->mtu, (u32 __user *)optval)) + val = sco_pi(sk)->conn->mtu; + if (copy_to_iter(&val, sizeof(val), &opt->iter_out) != + sizeof(val)) err = -EFAULT; break; @@ -1252,13 +1256,12 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, hci_dev_put(hdev); return -ENOBUFS; } - ptr = optval; - if (put_user(num_codecs, ptr)) { + if (copy_to_iter(&num_codecs, sizeof(num_codecs), + &opt->iter_out) != sizeof(num_codecs)) { hci_dev_put(hdev); return -EFAULT; } - ptr += sizeof(num_codecs); /* Iterate all the codecs supported over SCO and populate * codec data @@ -1275,11 +1278,11 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, if (err < 0) break; codec.num_caps = c->num_caps; - if (copy_to_user(ptr, &codec, sizeof(codec))) { + if (copy_to_iter(&codec, sizeof(codec), &opt->iter_out) + != sizeof(codec)) { err = -EFAULT; break; } - ptr += sizeof(codec); /* find codec capabilities data length */ len = 0; @@ -1289,11 +1292,11 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, } /* copy codec capabilities data */ - if (len && copy_to_user(ptr, c->caps, len)) { + if (len && + copy_to_iter(c->caps, len, &opt->iter_out) != len) { err = -EFAULT; break; } - ptr += len; } hci_dev_unlock(hdev); @@ -1301,8 +1304,8 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, lock_sock(sk); - if (!err && put_user(buf_len, optlen)) - err = -EFAULT; + if (!err) + opt->optlen = buf_len; break; @@ -1577,7 +1580,7 @@ static const struct proto_ops sco_sock_ops = { .socketpair = sock_no_socketpair, .shutdown = sco_sock_shutdown, .setsockopt = sco_sock_setsockopt, - .getsockopt = sco_sock_getsockopt + .getsockopt_iter = sco_sock_getsockopt }; static const struct net_proto_family sco_sock_family_ops = { -- 2.53.0-Meta
