Hello,

syzbot found the following issue on:

HEAD commit: 052d534373b7 Merge tag 'exfat-for-6.8-rc1' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14620debe80000 kernel config: https://syzkaller.appspot.com/x/.config?x=a7031f9e71583b4a dashboard link: https://syzkaller.appspot.com/bug?extid=ebe64cc5950868e77358 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a344c1e80000

Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/82a7201eef4c/disk-052d5343.raw.... vmlinux: https://storage.googleapis.com/syzbot-assets/ca12b4c31826/vmlinux-052d5343.x... kernel image: https://storage.googleapis.com/syzbot-assets/3f07360ba5a8/bzImage-052d5343.x...

IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ebe64cc5950868e77358@syzkaller.appspotmail.com

BUG: memory leak unreferenced object 0xffff88811c71a980 (size 64): comm "syz-executor.7", pid 5063, jiffies 4294953937 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 20 8e 7e 1c 81 88 ff ff ........ .~..... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 9f8721dd): [<ffffffff815f7d53>] kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline] [<ffffffff815f7d53>] slab_post_alloc_hook mm/slub.c:3817 [inline] [<ffffffff815f7d53>] slab_alloc_node mm/slub.c:3860 [inline] [<ffffffff815f7d53>] kmalloc_trace+0x283/0x330 mm/slub.c:4007 [<ffffffff84aae617>] kmalloc include/linux/slab.h:590 [inline] [<ffffffff84aae617>] kzalloc include/linux/slab.h:711 [inline] [<ffffffff84aae617>] batadv_tvlv_handler_register+0xf7/0x2a0 net/batman-adv/tvlv.c:560 [<ffffffff84a8d09f>] batadv_mcast_init+0x4f/0xc0 net/batman-adv/multicast.c:1926 [<ffffffff84a895b9>] batadv_mesh_init+0x209/0x2f0 net/batman-adv/main.c:231 [<ffffffff84a9fa88>] batadv_softif_init_late+0x1f8/0x280 net/batman-adv/soft-interface.c:812 [<ffffffff83f48559>] register_netdevice+0x189/0xca0 net/core/dev.c:10188 [<ffffffff84a9f255>] batadv_softif_newlink+0x55/0x70 net/batman-adv/soft-interface.c:1088 [<ffffffff83f61dc0>] rtnl_newlink_create net/core/rtnetlink.c:3515 [inline] [<ffffffff83f61dc0>] __rtnl_newlink+0xb10/0xec0 net/core/rtnetlink.c:3735 [<ffffffff83f621bc>] rtnl_newlink+0x4c/0x70 net/core/rtnetlink.c:3748 [<ffffffff83f5cd1f>] rtnetlink_rcv_msg+0x22f/0x5b0 net/core/rtnetlink.c:6615 [<ffffffff84093291>] netlink_rcv_skb+0x91/0x1d0 net/netlink/af_netlink.c:2543 [<ffffffff84092242>] netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] [<ffffffff84092242>] netlink_unicast+0x2c2/0x440 net/netlink/af_netlink.c:1367 [<ffffffff84092701>] netlink_sendmsg+0x341/0x690 net/netlink/af_netlink.c:1908 [<ffffffff83ef2912>] sock_sendmsg_nosec net/socket.c:730 [inline] [<ffffffff83ef2912>] __sock_sendmsg+0x52/0xa0 net/socket.c:745 [<ffffffff83ef5af4>] __sys_sendto+0x164/0x1e0 net/socket.c:2191 [<ffffffff83ef5b98>] __do_sys_sendto net/socket.c:2203 [inline] [<ffffffff83ef5b98>] __se_sys_sendto net/socket.c:2199 [inline] [<ffffffff83ef5b98>] __x64_sys_sendto+0x28/0x30 net/socket.c:2199

BUG: memory leak unreferenced object 0xffff88811c8561c0 (size 64): comm "syz-executor.0", pid 5062, jiffies 4294953941 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 20 ce 7e 1c 81 88 ff ff ........ .~..... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 7256c890): [<ffffffff815f7d53>] kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline] [<ffffffff815f7d53>] slab_post_alloc_hook mm/slub.c:3817 [inline] [<ffffffff815f7d53>] slab_alloc_node mm/slub.c:3860 [inline] [<ffffffff815f7d53>] kmalloc_trace+0x283/0x330 mm/slub.c:4007 [<ffffffff84aae617>] kmalloc include/linux/slab.h:590 [inline] [<ffffffff84aae617>] kzalloc include/linux/slab.h:711 [inline] [<ffffffff84aae617>] batadv_tvlv_handler_register+0xf7/0x2a0 net/batman-adv/tvlv.c:560 [<ffffffff84a8d09f>] batadv_mcast_init+0x4f/0xc0 net/batman-adv/multicast.c:1926 [<ffffffff84a895b9>] batadv_mesh_init+0x209/0x2f0 net/batman-adv/main.c:231 [<ffffffff84a9fa88>] batadv_softif_init_late+0x1f8/0x280 net/batman-adv/soft-interface.c:812 [<ffffffff83f48559>] register_netdevice+0x189/0xca0 net/core/dev.c:10188 [<ffffffff84a9f255>] batadv_softif_newlink+0x55/0x70 net/batman-adv/soft-interface.c:1088 [<ffffffff83f61dc0>] rtnl_newlink_create net/core/rtnetlink.c:3515 [inline] [<ffffffff83f61dc0>] __rtnl_newlink+0xb10/0xec0 net/core/rtnetlink.c:3735 [<ffffffff83f621bc>] rtnl_newlink+0x4c/0x70 net/core/rtnetlink.c:3748 [<ffffffff83f5cd1f>] rtnetlink_rcv_msg+0x22f/0x5b0 net/core/rtnetlink.c:6615 [<ffffffff84093291>] netlink_rcv_skb+0x91/0x1d0 net/netlink/af_netlink.c:2543 [<ffffffff84092242>] netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] [<ffffffff84092242>] netlink_unicast+0x2c2/0x440 net/netlink/af_netlink.c:1367 [<ffffffff84092701>] netlink_sendmsg+0x341/0x690 net/netlink/af_netlink.c:1908 [<ffffffff83ef2912>] sock_sendmsg_nosec net/socket.c:730 [inline] [<ffffffff83ef2912>] __sock_sendmsg+0x52/0xa0 net/socket.c:745 [<ffffffff83ef5af4>] __sys_sendto+0x164/0x1e0 net/socket.c:2191 [<ffffffff83ef5b98>] __do_sys_sendto net/socket.c:2203 [inline] [<ffffffff83ef5b98>] __se_sys_sendto net/socket.c:2199 [inline] [<ffffffff83ef5b98>] __x64_sys_sendto+0x28/0x30 net/socket.c:2199

BUG: memory leak unreferenced object 0xffff88811cd88cc0 (size 64): comm "syz-executor.5", pid 5078, jiffies 4294953981 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 20 8e 05 1d 81 88 ff ff ........ ....... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc a919e6d6): [<ffffffff815f7d53>] kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline] [<ffffffff815f7d53>] slab_post_alloc_hook mm/slub.c:3817 [inline] [<ffffffff815f7d53>] slab_alloc_node mm/slub.c:3860 [inline] [<ffffffff815f7d53>] kmalloc_trace+0x283/0x330 mm/slub.c:4007 [<ffffffff84aae617>] kmalloc include/linux/slab.h:590 [inline] [<ffffffff84aae617>] kzalloc include/linux/slab.h:711 [inline] [<ffffffff84aae617>] batadv_tvlv_handler_register+0xf7/0x2a0 net/batman-adv/tvlv.c:560 [<ffffffff84a8d09f>] batadv_mcast_init+0x4f/0xc0 net/batman-adv/multicast.c:1926 [<ffffffff84a895b9>] batadv_mesh_init+0x209/0x2f0 net/batman-adv/main.c:231 [<ffffffff84a9fa88>] batadv_softif_init_late+0x1f8/0x280 net/batman-adv/soft-interface.c:812 [<ffffffff83f48559>] register_netdevice+0x189/0xca0 net/core/dev.c:10188 [<ffffffff84a9f255>] batadv_softif_newlink+0x55/0x70 net/batman-adv/soft-interface.c:1088 [<ffffffff83f61dc0>] rtnl_newlink_create net/core/rtnetlink.c:3515 [inline] [<ffffffff83f61dc0>] __rtnl_newlink+0xb10/0xec0 net/core/rtnetlink.c:3735 [<ffffffff83f621bc>] rtnl_newlink+0x4c/0x70 net/core/rtnetlink.c:3748 [<ffffffff83f5cd1f>] rtnetlink_rcv_msg+0x22f/0x5b0 net/core/rtnetlink.c:6615 [<ffffffff84093291>] netlink_rcv_skb+0x91/0x1d0 net/netlink/af_netlink.c:2543 [<ffffffff84092242>] netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] [<ffffffff84092242>] netlink_unicast+0x2c2/0x440 net/netlink/af_netlink.c:1367 [<ffffffff84092701>] netlink_sendmsg+0x341/0x690 net/netlink/af_netlink.c:1908 [<ffffffff83ef2912>] sock_sendmsg_nosec net/socket.c:730 [inline] [<ffffffff83ef2912>] __sock_sendmsg+0x52/0xa0 net/socket.c:745 [<ffffffff83ef5af4>] __sys_sendto+0x164/0x1e0 net/socket.c:2191 [<ffffffff83ef5b98>] __do_sys_sendto net/socket.c:2203 [inline] [<ffffffff83ef5b98>] __se_sys_sendto net/socket.c:2199 [inline] [<ffffffff83ef5b98>] __x64_sys_sendto+0x28/0x30 net/socket.c:2199

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