CVE-2023-53685: In the Linux kernel, the following vulnerability has been resolved:  tun: Fix memory leak for detached NAPI queue.  syzkaller reported [0] memory leaks of sk and skb related to the TUN device with no repro, but we can reproduce it easily with:    struct ifreq ifr = {}   int fd_tun, fd_tmp;   char buf[4] = {};    fd_tun = openat(AT_FDCWD, "/dev/net/tun", O_WRONLY, 0);   ifr.ifr_flags = IFF_TUN | IFF_NAPI | IFF_MULTI_QUEUE;   ioctl(fd_tun, TUNSETIFF, &ifr);    ifr.ifr_flags = IFF_DETACH_QUEUE;   ioctl(fd_tun, TUNSETQUEUE, &ifr);    fd_tmp = socket(AF_PACKET, SOCK_PACKET, 0);   ifr.ifr_flags = IFF_UP;   ioctl(fd_tmp, SIOCSIFFLAGS, &ifr);    write(fd_tun, buf, sizeof(buf));   close(fd_tun);  If we enable NAPI and multi-queue on a TUN device, we can put skb into tfile->sk.sk_write_queue after the queue is detached.  We should prevent it by checking tfile->detached before queuing skb.  Note this must be done under tfile->sk.sk_write_queue.lock because write() and ioctl(IFF_DETACH_QUEUE) can run concurrently.  Otherwise, there would be a small race window:    write()                             ioctl(IFF_DETACH_QUEUE)   `- tun_get_user                     `- __tun_detach      |- if (tfile->detached)             |- tun_disable_queue      |  `-> false                        |  `- tfile->detached = tun      |                                   `- tun_queue_purge      |- spin_lock_bh(&queue->lock)      `- __skb_queue_tail(queue, skb)  Another solution is to call tun_queue_purge() when closing and reattaching the detached queue, but it could paper over another problems.  Also, we do the same kind of test for IFF_NAPI_FRAGS.  [0]: unreferenced object 0xffff88801edbc800 (size 2048):   comm "syz-executor.1", pid 33269, jiffies 4295743834 (age 18.756s)   hex dump (first 32 bytes):     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................     00 00 07 40 00 00 00 00 00 00 00 00 00 00 00 00  ...@............   backtrace:     [<000000008c16ea3d>] __do_kmalloc_node mm/slab_common.c:965 [inline]     [<000000008c16ea3d>] __kmalloc+0x4a/0x130 mm/slab_common.c:979     [<000000003addde56>] kmalloc include/linux/slab.h:563 [inline]     [<000000003addde56>] sk_prot_alloc+0xef/0x1b0 net/core/sock.c:2035     [<000000003e20621f>] sk_alloc+0x36/0x2f0 net/core/sock.c:2088     [<0000000028e43843>] tun_chr_open+0x3d/0x190 drivers/net/tun.c:3438     [<000000001b0f1f28>] misc_open+0x1a6/0x1f0 drivers/char/misc.c:165     [<000000004376f706>] chrdev_open+0x111/0x300 fs/char_dev.c:414     [<00000000614d379f>] do_dentry_open+0x2f9/0x750 fs/open.c:920     [<000000008eb24774>] do_open fs/namei.c:3636 [inline]     [<000000008eb24774>] path_openat+0x143f/0x1a30 fs/namei.c:3791     [<00000000955077b5>] do_filp_open+0xce/0x1c0 fs/namei.c:3818     [<00000000b78973b0>] do_sys_openat2+0xf0/0x260 fs/open.c:1356     [<00000000057be699>] do_sys_open fs/open.c:1372 [inline]     [<00000000057be699>] __do_sys_openat fs/open.c:1388 [inline]     [<00000000057be699>] __se_sys_openat fs/open.c:1383 [inline]     [<00000000057be699>] __x64_sys_openat+0x83/0xf0 fs/open.c:1383     [<00000000a7d2182d>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]     [<00000000a7d2182d>] do_syscall_64+0x3c/0x90 arch/x86/entry/common.c:80     [<000000004cc4e8c4>] entry_SYSCALL_64_after_hwframe+0x72/0xdc  unreferenced object 0xffff88802f671700 (size 240):   comm "syz-executor.1", pid 33269, jiffies 4295743854 (age 18.736s)   hex dump (first 32 bytes):     68 c9 db 1e 80 88 ff ff 68 c9 db 1e 80 88 ff ff  h.......h.......     00 c0 7b 2f 80 88 ff ff 00 c8 db 1e 80 88 ff ff  ..{/............   backtrace:     [<00000000e9d9fdb6>] __alloc_skb+0x223/0x250 net/core/skbuff.c:644     [<000000002c3e4e0b>] alloc_skb include/linux/skbuff.h:1288 [inline]     [<000000002c3e4e0b>] alloc_skb_with_frags+0x6f/0x350 net/core/skbuff.c:6378     [<00000000825f98d7>] sock_alloc_send_pskb+0x3ac/0x3e0 net/core/sock.c:2729     [<00000000e9eb3df3>] tun_alloc_skb drivers/net/tun.c:1529 [inline]     [< ---truncated---