Re: memory leak in ip_mc_add_src ( Not tainted 5.8.0-rc3+)
From: Dmitry Vyukov <dvyukov@google.com>
Date: 2020-07-10 06:44:30
On Fri, Jul 10, 2020 at 8:32 AM cH3332 XR [off-list ref] wrote:
Hi, SYZKALLER found the following Memory leak
FWIW also reported by syzbot a year ago: https://syzkaller.appspot.com/bug?id=c2e9e4f014f416e492dd46a41c068af268169d8e
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
BUG: memory leak
unreferenced object 0xffff955412ff9e00 (size 32):
comm "syz-executor.3", pid 4726, jiffies 4294777846 (age 3098.168s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
06 00 00 00 00 00 00 00 ac 1e 00 04 00 00 00 00 ................
backtrace:
[<000000002976d53e>] ip_mc_add_src+0x35f/0x3e0
[<00000000f22fc984>] ip_mc_source+0x2db/0x4e0
[<00000000a814b668>] do_ip_setsockopt.isra.14+0x541/0x11c0
[<0000000071f25adf>] ip_setsockopt+0x33/0xa0
[<00000000a49ec12e>] udp_setsockopt+0x40/0x90
[<000000002cc8a42f>] __sys_setsockopt+0x99/0x120
[<00000000167d1a29>] __x64_sys_setsockopt+0x22/0x30
[<00000000971d38a0>] do_syscall_64+0x3e/0x70
[<00000000b19407da>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff955412ff9280 (size 32):
comm "syz-executor.3", pid 4726, jiffies 4294777846 (age 3098.168s)
hex dump (first 32 bytes):
20 0d 77 0c 54 95 ff ff 00 00 00 00 00 00 00 00 .w.T...........
07 00 00 00 00 00 00 00 ac 1e 00 04 00 01 00 00 ................
backtrace:
[<000000002976d53e>] ip_mc_add_src+0x35f/0x3e0
[<00000000f22fc984>] ip_mc_source+0x2db/0x4e0
[<00000000a814b668>] do_ip_setsockopt.isra.14+0x541/0x11c0
[<0000000071f25adf>] ip_setsockopt+0x33/0xa0
[<00000000a49ec12e>] udp_setsockopt+0x40/0x90
[<000000002cc8a42f>] __sys_setsockopt+0x99/0x120
[<00000000167d1a29>] __x64_sys_setsockopt+0x22/0x30
[<00000000971d38a0>] do_syscall_64+0x3e/0x70
[<00000000b19407da>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff95540c770d20 (size 32):
comm "syz-executor.3", pid 27224, jiffies 4297068116 (age 807.903s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
01 00 00 00 00 00 00 00 ac 1e 01 04 00 01 00 00 ................
backtrace:
[<00000000a201d800>] ip_mc_add_src+0x1b2/0x3e0
[<00000000f22fc984>] ip_mc_source+0x2db/0x4e0
[<00000000a814b668>] do_ip_setsockopt.isra.14+0x541/0x11c0
[<0000000071f25adf>] ip_setsockopt+0x33/0xa0
[<00000000a49ec12e>] udp_setsockopt+0x40/0x90
[<000000002cc8a42f>] __sys_setsockopt+0x99/0x120
[<00000000167d1a29>] __x64_sys_setsockopt+0x22/0x30
[<00000000971d38a0>] do_syscall_64+0x3e/0x70
[<00000000b19407da>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: leak checking failed
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Execute Syzkaller programs
https://github.com/google/syzkaller/blob/master/docs/executing_syzkaller_programs.md
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