memory leak in nr_rx_frame (2)

From: syzbot
Date: Fri Aug 30 2019 - 15:28:31 EST

Hello,

syzbot found the following crash on:

HEAD commit: 6525771f Merge tag 'arc-5.3-rc7' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10200912600000
kernel config: https://syzkaller.appspot.com/x/.config?x=e6131eafb9408877
dashboard link: https://syzkaller.appspot.com/bug?extid=0145ea560de205bc09f0
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12b51f9c600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0145ea560de205bc09f0@xxxxxxxxxxxxxxxxxxxxxxxxx

2019/08/29 23:31:49 executed programs: 8
2019/08/29 23:31:56 executed programs: 15
2019/08/29 23:32:02 executed programs: 24
BUG: memory leak
unreferenced object 0xffff888123355800 (size 2048):
comm "softirq", pid 0, jiffies 4295062008 (age 25.620s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
06 00 07 40 00 00 00 00 00 00 00 00 00 00 00 00 ...@............
backtrace:
[<00000000bbb1ff80>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
[<00000000bbb1ff80>] slab_post_alloc_hook mm/slab.h:522 [inline]
[<00000000bbb1ff80>] slab_alloc mm/slab.c:3319 [inline]
[<00000000bbb1ff80>] __do_kmalloc mm/slab.c:3653 [inline]
[<00000000bbb1ff80>] __kmalloc+0x169/0x300 mm/slab.c:3664
[<000000003948180d>] kmalloc include/linux/slab.h:557 [inline]
[<000000003948180d>] sk_prot_alloc+0x112/0x170 net/core/sock.c:1603
[<00000000ad5c33ee>] sk_alloc+0x35/0x2f0 net/core/sock.c:1657
[<000000004e2b1f5c>] nr_make_new net/netrom/af_netrom.c:476 [inline]
[<000000004e2b1f5c>] nr_rx_frame+0x339/0x8ee net/netrom/af_netrom.c:959
[<00000000df4c3d82>] nr_loopback_timer+0x4e/0xd0 net/netrom/nr_loopback.c:59
[<00000000e886ef23>] call_timer_fn+0x45/0x1e0 kernel/time/timer.c:1322
[<00000000cc0c55bd>] expire_timers kernel/time/timer.c:1366 [inline]
[<00000000cc0c55bd>] __run_timers kernel/time/timer.c:1685 [inline]
[<00000000cc0c55bd>] __run_timers kernel/time/timer.c:1653 [inline]
[<00000000cc0c55bd>] run_timer_softirq+0x256/0x740 kernel/time/timer.c:1698
[<000000008a8ac853>] __do_softirq+0x115/0x33f kernel/softirq.c:292
[<00000000c33f7c40>] invoke_softirq kernel/softirq.c:373 [inline]
[<00000000c33f7c40>] irq_exit+0xbb/0xe0 kernel/softirq.c:413
[<00000000dc851865>] exiting_irq arch/x86/include/asm/apic.h:537 [inline]
[<00000000dc851865>] smp_apic_timer_interrupt+0x96/0x190 arch/x86/kernel/apic/apic.c:1133
[<000000006a57c22f>] apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
[<00000000ec52384e>] arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
[<00000000ec52384e>] console_unlock.part.0+0x5f0/0x6d0 kernel/printk/printk.c:2471
[<0000000013f07031>] console_unlock kernel/printk/printk.c:2364 [inline]
[<0000000013f07031>] vprintk_emit+0x251/0x360 kernel/printk/printk.c:1986
[<00000000704abaae>] vprintk_default+0x28/0x30 kernel/printk/printk.c:2013
[<000000008aa8a0ba>] vprintk_func+0x59/0xfa kernel/printk/printk_safe.c:386
[<000000004d884645>] printk+0x60/0x7d kernel/printk/printk.c:2046

BUG: memory leak
unreferenced object 0xffff88810e8bd820 (size 32):
comm "softirq", pid 0, jiffies 4295062008 (age 25.620s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
03 00 00 00 03 00 00 00 0f 00 00 00 00 00 00 00 ................
backtrace:
[<0000000092f05cd5>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
[<0000000092f05cd5>] slab_post_alloc_hook mm/slab.h:522 [inline]
[<0000000092f05cd5>] slab_alloc mm/slab.c:3319 [inline]
[<0000000092f05cd5>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
[<00000000f2b13853>] kmalloc include/linux/slab.h:552 [inline]
[<00000000f2b13853>] kzalloc include/linux/slab.h:748 [inline]
[<00000000f2b13853>] selinux_sk_alloc_security+0x48/0xb0 security/selinux/hooks.c:5073
[<000000002301f7f8>] security_sk_alloc+0x49/0x70 security/security.c:2029
[<000000009fb5708b>] sk_prot_alloc+0x12d/0x170 net/core/sock.c:1606
[<00000000ad5c33ee>] sk_alloc+0x35/0x2f0 net/core/sock.c:1657
[<000000004e2b1f5c>] nr_make_new net/netrom/af_netrom.c:476 [inline]
[<000000004e2b1f5c>] nr_rx_frame+0x339/0x8ee net/netrom/af_netrom.c:959
[<00000000df4c3d82>] nr_loopback_timer+0x4e/0xd0 net/netrom/nr_loopback.c:59
[<00000000e886ef23>] call_timer_fn+0x45/0x1e0 kernel/time/timer.c:1322
[<00000000cc0c55bd>] expire_timers kernel/time/timer.c:1366 [inline]
[<00000000cc0c55bd>] __run_timers kernel/time/timer.c:1685 [inline]
[<00000000cc0c55bd>] __run_timers kernel/time/timer.c:1653 [inline]
[<00000000cc0c55bd>] run_timer_softirq+0x256/0x740 kernel/time/timer.c:1698
[<000000008a8ac853>] __do_softirq+0x115/0x33f kernel/softirq.c:292
[<00000000c33f7c40>] invoke_softirq kernel/softirq.c:373 [inline]
[<00000000c33f7c40>] irq_exit+0xbb/0xe0 kernel/softirq.c:413
[<00000000dc851865>] exiting_irq arch/x86/include/asm/apic.h:537 [inline]
[<00000000dc851865>] smp_apic_timer_interrupt+0x96/0x190 arch/x86/kernel/apic/apic.c:1133
[<000000006a57c22f>] apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
[<00000000ec52384e>] arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
[<00000000ec52384e>] console_unlock.part.0+0x5f0/0x6d0 kernel/printk/printk.c:2471
[<0000000013f07031>] console_unlock kernel/printk/printk.c:2364 [inline]
[<0000000013f07031>] vprintk_emit+0x251/0x360 kernel/printk/printk.c:1986
[<00000000704abaae>] vprintk_default+0x28/0x30 kernel/printk/printk.c:2013



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