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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2024-04-05 15:41:52 -0400
committerLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2024-04-10 15:03:46 -0400
commit51eda36d33e43201e7a4fd35232e069b2c850b01 (patch)
tree960adfedb0647decf222d2a17876821c3ae665f8 /net
parent45d355a926ab40f3ae7bc0b0a00cb0e3e8a5a810 (diff)
Bluetooth: SCO: Fix not validating setsockopt user input
syzbot reported sco_sock_setsockopt() is copying data without checking user input length. BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline] BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline] BUG: KASAN: slab-out-of-bounds in sco_sock_setsockopt+0xc0b/0xf90 net/bluetooth/sco.c:893 Read of size 4 at addr ffff88805f7b15a3 by task syz-executor.5/12578 Fixes: ad10b1a48754 ("Bluetooth: Add Bluetooth socket voice option") Fixes: b96e9c671b05 ("Bluetooth: Add BT_DEFER_SETUP option to sco socket") Fixes: 00398e1d5183 ("Bluetooth: Add support for BT_PKT_STATUS CMSG data for SCO connections") Fixes: f6873401a608 ("Bluetooth: Allow setting of codec for HFP offload use case") Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Diffstat (limited to 'net')
-rw-r--r--net/bluetooth/sco.c23
1 files changed, 10 insertions, 13 deletions
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 43daf965a01e..368e026f4d15 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -824,7 +824,7 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
sockptr_t optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
- int len, err = 0;
+ int err = 0;
struct bt_voice voice;
u32 opt;
struct bt_codecs *codecs;
@@ -843,10 +843,9 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
break;
}
- if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
- err = -EFAULT;
+ err = bt_copy_from_sockptr(&opt, sizeof(opt), optval, optlen);
+ if (err)
break;
- }
if (opt)
set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
@@ -863,11 +862,10 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
voice.setting = sco_pi(sk)->setting;
- len = min_t(unsigned int, sizeof(voice), optlen);
- if (copy_from_sockptr(&voice, optval, len)) {
- err = -EFAULT;
+ err = bt_copy_from_sockptr(&voice, sizeof(voice), optval,
+ optlen);
+ if (err)
break;
- }
/* Explicitly check for these values */
if (voice.setting != BT_VOICE_TRANSPARENT &&
@@ -890,10 +888,9 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
break;
case BT_PKT_STATUS:
- if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
- err = -EFAULT;
+ err = bt_copy_from_sockptr(&opt, sizeof(opt), optval, optlen);
+ if (err)
break;
- }
if (opt)
set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
@@ -934,9 +931,9 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
break;
}
- if (copy_from_sockptr(buffer, optval, optlen)) {
+ err = bt_copy_from_sockptr(buffer, optlen, optval, optlen);
+ if (err) {
hci_dev_put(hdev);
- err = -EFAULT;
break;
}