memory leak in llc_ui_create (2)

From: syzbot
Date: Fri Jun 21 2019 - 08:57:23 EST

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=14cc10b1a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=56f1da14935c3cce
dashboard link: https://syzkaller.appspot.com/bug?extid=6bf095f9becf5efef645
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1698d45ea00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+6bf095f9becf5efef645@xxxxxxxxxxxxxxxxxxxxxxxxx

85.529503][ T7031] 8021q: adding VLAN 0 to HW filter on device batadv0
2019/06/20 19:36:46 executed programs: 1
2019/06/20 19:36:51 executed programs: 3
BUG: memory leak
unreferenced object 0xffff888118b8d800 (size 2048):
comm "syz-executor.0", pid 7054, jiffies 4295036362 (age 12.560s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
1a 00 07 40 00 00 00 00 00 00 00 00 00 00 00 00 ...@............
backtrace:
[<000000004a3a66c0>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
[<000000004a3a66c0>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<000000004a3a66c0>] slab_alloc mm/slab.c:3326 [inline]
[<000000004a3a66c0>] __do_kmalloc mm/slab.c:3658 [inline]
[<000000004a3a66c0>] __kmalloc+0x161/0x2c0 mm/slab.c:3669
[<00000000cc5a7d28>] kmalloc include/linux/slab.h:552 [inline]
[<00000000cc5a7d28>] sk_prot_alloc+0xd6/0x170 net/core/sock.c:1602
[<000000000c449f88>] sk_alloc+0x35/0x2f0 net/core/sock.c:1656
[<0000000008b99378>] llc_sk_alloc+0x35/0x170 net/llc/llc_conn.c:950
[<00000000d4e72aed>] llc_ui_create+0x7b/0x140 net/llc/af_llc.c:173
[<00000000d0bfef06>] __sock_create+0x164/0x250 net/socket.c:1424
[<0000000058cf7a3c>] sock_create net/socket.c:1475 [inline]
[<0000000058cf7a3c>] __sys_socket+0x69/0x110 net/socket.c:1517
[<000000003ce548ba>] __do_sys_socket net/socket.c:1526 [inline]
[<000000003ce548ba>] __se_sys_socket net/socket.c:1524 [inline]
[<000000003ce548ba>] __x64_sys_socket+0x1e/0x30 net/socket.c:1524
[<0000000029c8eba9>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301
[<00000000dba589d4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888120dd7a00 (size 224):
comm "syz-executor.0", pid 7054, jiffies 4295036362 (age 12.560s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 10 0c 24 81 88 ff ff 00 d8 b8 18 81 88 ff ff ...$............
backtrace:
[<00000000b6c096c6>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
[<00000000b6c096c6>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<00000000b6c096c6>] slab_alloc_node mm/slab.c:3269 [inline]
[<00000000b6c096c6>] kmem_cache_alloc_node+0x153/0x2a0 mm/slab.c:3579
[<00000000556a01d4>] __alloc_skb+0x6e/0x210 net/core/skbuff.c:194
[<0000000085622924>] alloc_skb include/linux/skbuff.h:1054 [inline]
[<0000000085622924>] alloc_skb_with_frags+0x5f/0x250 net/core/skbuff.c:5328
[<00000000ca5b438b>] sock_alloc_send_pskb+0x269/0x2a0 net/core/sock.c:2222
[<0000000044a5b8c6>] sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2239
[<00000000b19d8ca2>] llc_ui_sendmsg+0x10a/0x540 net/llc/af_llc.c:933
[<00000000aaeaeaf3>] sock_sendmsg_nosec net/socket.c:646 [inline]
[<00000000aaeaeaf3>] sock_sendmsg+0x54/0x70 net/socket.c:665
[<000000009ae2ec20>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2286
[<000000003ac4094d>] __sys_sendmsg+0x80/0xf0 net/socket.c:2324
[<00000000d3b808ba>] __do_sys_sendmsg net/socket.c:2333 [inline]
[<00000000d3b808ba>] __se_sys_sendmsg net/socket.c:2331 [inline]
[<00000000d3b808ba>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2331
[<0000000029c8eba9>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301
[<00000000dba589d4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff8881178e3800 (size 512):
comm "syz-executor.0", pid 7054, jiffies 4295036362 (age 12.560s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 ad ad f3 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000baa5fe0c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
[<00000000baa5fe0c>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<00000000baa5fe0c>] slab_alloc_node mm/slab.c:3269 [inline]
[<00000000baa5fe0c>] kmem_cache_alloc_node_trace+0x15b/0x2a0 mm/slab.c:3597
[<00000000ef42ca2e>] __do_kmalloc_node mm/slab.c:3619 [inline]
[<00000000ef42ca2e>] __kmalloc_node_track_caller+0x38/0x50 mm/slab.c:3634
[<00000000792340d3>] __kmalloc_reserve.isra.0+0x40/0xb0 net/core/skbuff.c:138
[<000000003b989a40>] __alloc_skb+0xa0/0x210 net/core/skbuff.c:206
[<0000000085622924>] alloc_skb include/linux/skbuff.h:1054 [inline]
[<0000000085622924>] alloc_skb_with_frags+0x5f/0x250 net/core/skbuff.c:5328
[<00000000ca5b438b>] sock_alloc_send_pskb+0x269/0x2a0 net/core/sock.c:2222
[<0000000044a5b8c6>] sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2239
[<00000000b19d8ca2>] llc_ui_sendmsg+0x10a/0x540 net/llc/af_llc.c:933
[<00000000aaeaeaf3>] sock_sendmsg_nosec net/socket.c:646 [inline]
[<00000000aaeaeaf3>] sock_sendmsg+0x54/0x70 net/socket.c:665
[<000000009ae2ec20>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2286
[<000000003ac4094d>] __sys_sendmsg+0x80/0xf0 net/socket.c:2324
[<00000000d3b808ba>] __do_sys_sendmsg net/socket.c:2333 [inline]
[<00000000d3b808ba>] __se_sys_sendmsg net/socket.c:2331 [inline]
[<00000000d3b808ba>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2331
[<0000000029c8eba9>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301
[<00000000dba589d4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9



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