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Dismiss alert {{ message }} gregkh / linux Public Notifications You must be signed in to change notification settings Fork 676 Star 636 Code Actions Security and quality 0 Insights Additional navigation options Code Actions Security and quality Insights Commit 69fcb03 Browse files Browse files ea1davis authored and gregkh committed Bluetooth: hci_sock: Prevent race in socket write iter and sock bind [ Upstream commit 89bb613 ] There is a potential race condition between sock bind and socket write iter. bind may free the same cmd via mgmt_pending before write iter sends the cmd, just as syzbot reported in UAF[1]. Here we use hci_dev_lock to synchronize the two, thereby avoiding the UAF mentioned in [1]. [1] syzbot reported: BUG: KASAN: slab-use-after-free in mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316 Read of size 8 at addr ffff888077164818 by task syz.0.17/5989 Call Trace: mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316 set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918 hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719 hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 sock_write_iter+0x279/0x360 net/socket.c:1195 Allocated by task 5989: mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296 set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910 hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719 hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 sock_write_iter+0x279/0x360 net/socket.c:1195 Freed by task 5991: mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline] mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257 mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477 hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314 Fixes: 6fe26f6 ("Bluetooth: MGMT: Protect mgmt_pending list with its own lock") Reported-by: syzbot+9aa47cd4633a3cf92a80@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=9aa47cd4633a3cf92a80 Tested-by: syzbot+9aa47cd4633a3cf92a80@syzkaller.appspotmail.com Signed-off-by: Edward Adam Davis &lt;eadavis@qq.com&gt; Signed-off-by: Luiz Augusto von Dentz &lt;luiz.von.dentz@intel.com&gt; Signed-off-by: Sasha Levin &lt;sashal@kernel.org&gt; 1 parent b30cd4d commit 69fcb03 Copy full SHA for 69fcb03 1 file changed + 2 Lines changed: 2 additions &amp; 0 deletions File tree Expand file tree Collapse file tree Open diff view settings Filter options net/bluetooth hci_sock.c Expand file tree Collapse file tree Open diff view settings Collapse file ‎ net/bluetooth/hci_sock.c ‎ Copy file name to clipboard Expand all lines: net/bluetooth/hci_sock.c + 2 Lines changed: 2 additions &amp; 0 deletions Original file line number Diff line number Diff line change @@ -1311,7 +1311,9 @@ static int hci_sock_bind(struct socket *sock, struct sockaddr *addr, 1311 1311 goto done ; 1312 1312 } 1313 1313 1314 + hci_dev_lock ( hdev ); 1314 1315 mgmt_index_removed ( hdev ); 1316 + hci_dev_unlock ( hdev ); 1315 1317 1316 1318 err = hci_dev_open ( hdev -&gt; id ); 1317 1319 if ( err ) { 0 commit comments Comments 0 ( 0 ) Footer &copy; 2026 GitHub,&nbsp;Inc. 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