netdev - memory leak in ip_mc_add

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Date:   Thu, 27 Jun 2019 01:17:05 -0700
From:   syzbot <syzbot+6ca1abd0db68b5173a4f@...kaller.appspotmail.com>
To:     davem@...emloft.net, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
Subject: memory leak in ip_mc_add_src (2)

Hello,

syzbot found the following crash on:

HEAD commit:    249155c2 Merge branch 'parisc-5.2-4' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=122594ada00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1db8bd6825f9661c
dashboard link: https://syzkaller.appspot.com/bug?extid=6ca1abd0db68b5173a4f
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15dc46eea00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17ee5aada00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+6ca1abd0db68b5173a4f@...kaller.appspotmail.com

executing program
executing program
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88811450f140 (size 64):
   comm "softirq", pid 0, jiffies 4294942448 (age 32.070s)
   hex dump (first 32 bytes):
     00 00 00 00 00 00 00 00 ff ff ff ff 00 00 00 00  ................
     00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000c7bad083>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<00000000c7bad083>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000c7bad083>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000c7bad083>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<000000009acc4151>] kmalloc include/linux/slab.h:547 [inline]
     [<000000009acc4151>] kzalloc include/linux/slab.h:742 [inline]
     [<000000009acc4151>] ip_mc_add1_src net/ipv4/igmp.c:1976 [inline]
     [<000000009acc4151>] ip_mc_add_src+0x36b/0x400 net/ipv4/igmp.c:2100
     [<000000004ac14566>] ip_mc_msfilter+0x22d/0x310 net/ipv4/igmp.c:2484
     [<0000000052d8f995>] do_ip_setsockopt.isra.0+0x1795/0x1930  
net/ipv4/ip_sockglue.c:959
     [<000000004ee1e21f>] ip_setsockopt+0x3b/0xb0 net/ipv4/ip_sockglue.c:1248
     [<0000000066cdfe74>] udp_setsockopt+0x4e/0x90 net/ipv4/udp.c:2618
     [<000000009383a786>] sock_common_setsockopt+0x38/0x50  
net/core/sock.c:3126
     [<00000000d8ac0c94>] __sys_setsockopt+0x98/0x120 net/socket.c:2072
     [<000000001b1e9666>] __do_sys_setsockopt net/socket.c:2083 [inline]
     [<000000001b1e9666>] __se_sys_setsockopt net/socket.c:2080 [inline]
     [<000000001b1e9666>] __x64_sys_setsockopt+0x26/0x30 net/socket.c:2080
     [<00000000420d395e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<000000007fd83a4b>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810ec5ab40 (size 64):
   comm "softirq", pid 0, jiffies 4294943651 (age 20.040s)
   hex dump (first 32 bytes):
     00 00 00 00 00 00 00 00 ff ff ff ff 00 00 00 00  ................
     00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000c7bad083>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<00000000c7bad083>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000c7bad083>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000c7bad083>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<000000009acc4151>] kmalloc include/linux/slab.h:547 [inline]
     [<000000009acc4151>] kzalloc include/linux/slab.h:742 [inline]
     [<000000009acc4151>] ip_mc_add1_src net/ipv4/igmp.c:1976 [inline]
     [<000000009acc4151>] ip_mc_add_src+0x36b/0x400 net/ipv4/igmp.c:2100
     [<000000004ac14566>] ip_mc_msfilter+0x22d/0x310 net/ipv4/igmp.c:2484
     [<0000000052d8f995>] do_ip_setsockopt.isra.0+0x1795/0x1930  
net/ipv4/ip_sockglue.c:959
     [<000000004ee1e21f>] ip_setsockopt+0x3b/0xb0 net/ipv4/ip_sockglue.c:1248
     [<0000000066cdfe74>] udp_setsockopt+0x4e/0x90 net/ipv4/udp.c:2618
     [<000000009383a786>] sock_common_setsockopt+0x38/0x50  
net/core/sock.c:3126
     [<00000000d8ac0c94>] __sys_setsockopt+0x98/0x120 net/socket.c:2072
     [<000000001b1e9666>] __do_sys_setsockopt net/socket.c:2083 [inline]
     [<000000001b1e9666>] __se_sys_setsockopt net/socket.c:2080 [inline]
     [<000000001b1e9666>] __x64_sys_setsockopt+0x26/0x30 net/socket.c:2080
     [<00000000420d395e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<000000007fd83a4b>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888112a6e080 (size 64):
   comm "softirq", pid 0, jiffies 4294944252 (age 14.030s)
   hex dump (first 32 bytes):
     00 00 00 00 00 00 00 00 ff ff ff ff 00 00 00 00  ................
     00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000c7bad083>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<00000000c7bad083>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000c7bad083>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000c7bad083>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<000000009acc4151>] kmalloc include/linux/slab.h:547 [inline]
     [<000000009acc4151>] kzalloc include/linux/slab.h:742 [inline]
     [<000000009acc4151>] ip_mc_add1_src net/ipv4/igmp.c:1976 [inline]
     [<000000009acc4151>] ip_mc_add_src+0x36b/0x400 net/ipv4/igmp.c:2100
     [<000000004ac14566>] ip_mc_msfilter+0x22d/0x310 net/ipv4/igmp.c:2484
     [<0000000052d8f995>] do_ip_setsockopt.isra.0+0x1795/0x1930  
net/ipv4/ip_sockglue.c:959
     [<000000004ee1e21f>] ip_setsockopt+0x3b/0xb0 net/ipv4/ip_sockglue.c:1248
     [<0000000066cdfe74>] udp_setsockopt+0x4e/0x90 net/ipv4/udp.c:2618
     [<000000009383a786>] sock_common_setsockopt+0x38/0x50  
net/core/sock.c:3126
     [<00000000d8ac0c94>] __sys_setsockopt+0x98/0x120 net/socket.c:2072
     [<000000001b1e9666>] __do_sys_setsockopt net/socket.c:2083 [inline]
     [<000000001b1e9666>] __se_sys_setsockopt net/socket.c:2080 [inline]
     [<000000001b1e9666>] __x64_sys_setsockopt+0x26/0x30 net/socket.c:2080
     [<00000000420d395e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<000000007fd83a4b>] entry_SYSCALL_64_after_hwframe+0x44/0xa9



---
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