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SubjectRe: memory leak in mcba_usb_probe
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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in rxrpc_lookup_local

BUG: memory leak
unreferenced object 0xffff888118b2f300 (size 256):
comm "syz-executor.5", pid 8860, jiffies 4294944050 (age 373.640s)
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 0a 00 00 00 00 80 c3 18 81 88 ff ff ................
backtrace:
[<00000000799c996d>] kmalloc include/linux/slab.h:552 [inline]
[<00000000799c996d>] kzalloc include/linux/slab.h:682 [inline]
[<00000000799c996d>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<00000000799c996d>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<00000000a9547b72>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000c8d0f9b2>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<0000000029791b25>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<000000005937929d>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<0000000064e0e1db>] setup_net+0xde/0x2d0 net/core/net_namespace.c:342
[<00000000ca4d5a61>] copy_net_ns+0x19f/0x3e0 net/core/net_namespace.c:483
[<0000000029feabb4>] create_new_namespaces+0x199/0x4f0 kernel/nsproxy.c:110
[<000000005ce44751>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
[<000000003c257699>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2957
[<000000001788a4be>] __do_sys_unshare kernel/fork.c:3025 [inline]
[<000000001788a4be>] __se_sys_unshare kernel/fork.c:3023 [inline]
[<000000001788a4be>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3023
[<00000000db77e81f>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<0000000052c5dd81>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888118afb200 (size 256):
comm "syz-executor.0", pid 8858, jiffies 4294944054 (age 373.600s)
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 0a 00 00 00 00 00 92 18 81 88 ff ff ................
backtrace:
[<00000000799c996d>] kmalloc include/linux/slab.h:552 [inline]
[<00000000799c996d>] kzalloc include/linux/slab.h:682 [inline]
[<00000000799c996d>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<00000000799c996d>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<00000000a9547b72>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000c8d0f9b2>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<0000000029791b25>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<000000005937929d>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<0000000064e0e1db>] setup_net+0xde/0x2d0 net/core/net_namespace.c:342
[<00000000ca4d5a61>] copy_net_ns+0x19f/0x3e0 net/core/net_namespace.c:483
[<0000000029feabb4>] create_new_namespaces+0x199/0x4f0 kernel/nsproxy.c:110
[<000000005ce44751>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
[<000000003c257699>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2957
[<000000001788a4be>] __do_sys_unshare kernel/fork.c:3025 [inline]
[<000000001788a4be>] __se_sys_unshare kernel/fork.c:3023 [inline]
[<000000001788a4be>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3023
[<00000000db77e81f>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<0000000052c5dd81>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff8881189f4800 (size 256):
comm "syz-executor.6", pid 8856, jiffies 4294944054 (age 373.600s)
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 0a 00 00 00 00 c0 56 18 81 88 ff ff ..........V.....
backtrace:
[<00000000799c996d>] kmalloc include/linux/slab.h:552 [inline]
[<00000000799c996d>] kzalloc include/linux/slab.h:682 [inline]
[<00000000799c996d>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<00000000799c996d>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<00000000a9547b72>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000c8d0f9b2>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<0000000029791b25>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<000000005937929d>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<0000000064e0e1db>] setup_net+0xde/0x2d0 net/core/net_namespace.c:342
[<00000000ca4d5a61>] copy_net_ns+0x19f/0x3e0 net/core/net_namespace.c:483
[<0000000029feabb4>] create_new_namespaces+0x199/0x4f0 kernel/nsproxy.c:110
[<000000005ce44751>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
[<000000003c257699>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2957
[<000000001788a4be>] __do_sys_unshare kernel/fork.c:3025 [inline]
[<000000001788a4be>] __se_sys_unshare kernel/fork.c:3023 [inline]
[<000000001788a4be>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3023
[<00000000db77e81f>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<0000000052c5dd81>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888118c34100 (size 256):
comm "syz-executor.2", pid 8861, jiffies 4294944055 (age 373.590s)
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 0a 00 00 00 00 40 56 18 81 88 ff ff .........@V.....
backtrace:
[<00000000799c996d>] kmalloc include/linux/slab.h:552 [inline]
[<00000000799c996d>] kzalloc include/linux/slab.h:682 [inline]
[<00000000799c996d>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<00000000799c996d>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<00000000a9547b72>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000c8d0f9b2>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<0000000029791b25>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<000000005937929d>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<0000000064e0e1db>] setup_net+0xde/0x2d0 net/core/net_namespace.c:342
[<00000000ca4d5a61>] copy_net_ns+0x19f/0x3e0 net/core/net_namespace.c:483
[<0000000029feabb4>] create_new_namespaces+0x199/0x4f0 kernel/nsproxy.c:110
[<000000005ce44751>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
[<000000003c257699>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2957
[<000000001788a4be>] __do_sys_unshare kernel/fork.c:3025 [inline]
[<000000001788a4be>] __se_sys_unshare kernel/fork.c:3023 [inline]
[<000000001788a4be>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3023
[<00000000db77e81f>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<0000000052c5dd81>] entry_SYSCALL_64_after_hwframe+0x44/0xa9



Tested on:

commit: 080e743d can: mcba_usb: Fix memory leak when cancelling urb
git tree: https://github.com/minhbq-99/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1322c7a8d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=67a7baec24faba80
dashboard link: https://syzkaller.appspot.com/bug?extid=57281c762a3922e14dfe
compiler: gcc (GCC) 10.1.0-syz 20200507

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