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Subjectmemory leak in fdb_create
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Hello,

syzbot found the following crash on:

HEAD commit: abf02e29 Merge tag 'pm-5.2-rc6' of git://git.kernel.org/pu..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12970eb2a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=56f1da14935c3cce
dashboard link: https://syzkaller.appspot.com/bug?extid=88533dc8b582309bf3ee
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16de5c06a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10546026a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+88533dc8b582309bf3ee@syzkaller.appspotmail.com

ffffffffda RBX: 0000000000000000 RCX: 0000000000441519
BUG: memory leak
unreferenced object 0xffff888123886800 (size 128):
comm "softirq", pid 0, jiffies 4294945699 (age 13.160s)
hex dump (first 32 bytes):
81 89 f8 20 81 88 ff ff 00 00 00 00 00 00 00 00 ... ............
32 f9 fc b7 11 e2 01 00 00 00 00 00 00 00 00 00 2...............
backtrace:
[<00000000ca2421fa>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<00000000ca2421fa>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<00000000ca2421fa>] slab_alloc mm/slab.c:3326 [inline]
[<00000000ca2421fa>] kmem_cache_alloc+0x134/0x270 mm/slab.c:3488
[<000000007faade68>] fdb_create+0x49/0x5a0 net/bridge/br_fdb.c:492
[<00000000772dfc36>] fdb_insert+0xb7/0x100 net/bridge/br_fdb.c:536
[<00000000ded35dd0>] br_fdb_insert+0x3b/0x60 net/bridge/br_fdb.c:552
[<00000000758ae277>] __vlan_add+0x617/0xdf0 net/bridge/br_vlan.c:284
[<0000000054c3b165>] br_vlan_add+0x26f/0x480 net/bridge/br_vlan.c:678
[<00000000ed895462>] br_vlan_init+0xe9/0x130 net/bridge/br_vlan.c:1061
[<00000000f916c753>] br_dev_init+0xa6/0x170 net/bridge/br_device.c:137
[<00000000a4e1a1ea>] register_netdevice+0xbf/0x600 net/core/dev.c:8663
[<00000000bdcf4ebd>] register_netdev+0x24/0x40 net/core/dev.c:8851
[<0000000042e6c0c4>] br_add_bridge+0x5e/0xa0 net/bridge/br_if.c:456
[<0000000036402409>] br_ioctl_deviceless_stub+0x30c/0x350
net/bridge/br_ioctl.c:374
[<00000000e57c9a76>] sock_ioctl+0x287/0x480 net/socket.c:1141
[<00000000109b8329>] vfs_ioctl fs/ioctl.c:46 [inline]
[<00000000109b8329>] file_ioctl fs/ioctl.c:509 [inline]
[<00000000109b8329>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<00000000d8eb5a5e>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000cd162915>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000cd162915>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000cd162915>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718

BUG: memory leak
unreferenced object 0xffff88811ced2de0 (size 32):
comm "syz-executor140", pid 6998, jiffies 4294945699 (age 13.160s)
hex dump (first 32 bytes):
d3 d2 f1 a7 6c 83 5b 30 30 15 a1 6f 77 3f 00 00 ....l.[00..ow?..
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000d53fdc1e>] kmemleak_alloc_recursive
include/linux/kmemleak.h:43 [inline]
[<00000000d53fdc1e>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<00000000d53fdc1e>] slab_alloc mm/slab.c:3326 [inline]
[<00000000d53fdc1e>] __do_kmalloc mm/slab.c:3658 [inline]
[<00000000d53fdc1e>] __kmalloc_track_caller+0x15d/0x2c0 mm/slab.c:3675
[<00000000c742d29c>] kstrdup+0x3a/0x70 mm/util.c:52
[<00000000d3df5d2b>] kstrdup_const+0x48/0x60 mm/util.c:74
[<00000000d75a8fa8>] kvasprintf_const+0x7e/0xe0 lib/kasprintf.c:48
[<00000000ebee37a0>] kobject_set_name_vargs+0x40/0xe0 lib/kobject.c:289
[<00000000c23c056a>] dev_set_name+0x63/0x90 drivers/base/core.c:1915
[<000000004c47b6d3>] netdev_register_kobject+0x5a/0x1b0
net/core/net-sysfs.c:1727
[<000000005fb074af>] register_netdevice+0x397/0x600 net/core/dev.c:8733
[<00000000bdcf4ebd>] register_netdev+0x24/0x40 net/core/dev.c:8851
[<0000000042e6c0c4>] br_add_bridge+0x5e/0xa0 net/bridge/br_if.c:456
[<0000000036402409>] br_ioctl_deviceless_stub+0x30c/0x350
net/bridge/br_ioctl.c:374
[<00000000e57c9a76>] sock_ioctl+0x287/0x480 net/socket.c:1141
[<00000000109b8329>] vfs_ioctl fs/ioctl.c:46 [inline]
[<00000000109b8329>] file_ioctl fs/ioctl.c:509 [inline]
[<00000000109b8329>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<00000000d8eb5a5e>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<00000000cd162915>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<00000000cd162915>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<00000000cd162915>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<0000000069b4ac36>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301



---
This bug is generated by a bot. It may contain errors.
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