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authorWang Hai <wanghai38@huawei.com>2020-06-11 15:57:50 +0800
committerDavid S. Miller <davem@davemloft.net>2020-06-15 13:29:39 -0700
commitea2fce88d2fd678ed9d45354ff49b73f1d5615dd (patch)
tree85c0378b6cb0e4df9af1c03524ad64c740c60bd0 /net
parent7c6cdf6376d563ddaf9229cf39c4f372516eb3ad (diff)
downloadlinux-sh-ea2fce88d2fd678ed9d45354ff49b73f1d5615dd.tar.gz
mld: fix memory leak in ipv6_mc_destroy_dev()
Commit a84d01647989 ("mld: fix memory leak in mld_del_delrec()") fixed the memory leak of MLD, but missing the ipv6_mc_destroy_dev() path, in which mca_sources are leaked after ma_put(). Using ip6_mc_clear_src() to take care of the missing free. BUG: memory leak unreferenced object 0xffff8881113d3180 (size 64): comm "syz-executor071", pid 389, jiffies 4294887985 (age 17.943s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 ff 02 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 ................ backtrace: [<000000002cbc483c>] kmalloc include/linux/slab.h:555 [inline] [<000000002cbc483c>] kzalloc include/linux/slab.h:669 [inline] [<000000002cbc483c>] ip6_mc_add1_src net/ipv6/mcast.c:2237 [inline] [<000000002cbc483c>] ip6_mc_add_src+0x7f5/0xbb0 net/ipv6/mcast.c:2357 [<0000000058b8b1ff>] ip6_mc_source+0xe0c/0x1530 net/ipv6/mcast.c:449 [<000000000bfc4fb5>] do_ipv6_setsockopt.isra.12+0x1b2c/0x3b30 net/ipv6/ipv6_sockglue.c:754 [<00000000e4e7a722>] ipv6_setsockopt+0xda/0x150 net/ipv6/ipv6_sockglue.c:950 [<0000000029260d9a>] rawv6_setsockopt+0x45/0x100 net/ipv6/raw.c:1081 [<000000005c1b46f9>] __sys_setsockopt+0x131/0x210 net/socket.c:2132 [<000000008491f7db>] __do_sys_setsockopt net/socket.c:2148 [inline] [<000000008491f7db>] __se_sys_setsockopt net/socket.c:2145 [inline] [<000000008491f7db>] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2145 [<00000000c7bc11c5>] do_syscall_64+0xa1/0x530 arch/x86/entry/common.c:295 [<000000005fb7a3f3>] entry_SYSCALL_64_after_hwframe+0x49/0xb3 Fixes: 1666d49e1d41 ("mld: do not remove mld souce list info when set link down") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wang Hai <wanghai38@huawei.com> Acked-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/mcast.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 7e12d2114158..8cd2782a31e4 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -2615,6 +2615,7 @@ void ipv6_mc_destroy_dev(struct inet6_dev *idev)
idev->mc_list = i->next;
write_unlock_bh(&idev->lock);
+ ip6_mc_clear_src(i);
ma_put(i);
write_lock_bh(&idev->lock);
}