Hello,
I've hit the following memory leak while running syzkaller fuzzer:
unreferenced object 0xffff88002ea39708 (size 64):
comm "syz-executor", pid 19887, jiffies 4295848369 (age 8.676s)
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 00 00 00 00 04 00 00 00 04 00 00 00 ................
backtrace:
[< inline >] kzalloc include/linux/slab.h:607
[< inline >] ip_options_get_alloc net/ipv4/ip_options.c:515
[<ffffffff85836ea4>] ip_options_get+0x34/0x90 net/ipv4/ip_options.c:551
[<ffffffff8584924d>] ip_cmsg_send+0x5bd/0x6f0 net/ipv4/ip_sockglue.c:252
[<ffffffff858e8502>] raw_sendmsg+0xa52/0x25a0 net/ieee802154/socket.c:738
[<ffffffff859246e7>] inet_sendmsg+0x2f7/0x4c0 net/ipv4/af_inet.c:736
[< inline >] sock_sendmsg_nosec net/socket.c:611
[<ffffffff854cdffa>] sock_sendmsg+0xca/0x110 net/socket.c:621
[<ffffffff854cfe3a>] ___sys_sendmsg+0x72a/0x840 net/socket.c:1947
[<ffffffff854d1e0e>] __sys_sendmsg+0xce/0x170 net/socket.c:1981
[< inline >] SYSC_sendmsg net/socket.c:1992
[<ffffffff854d1edd>] SyS_sendmsg+0x2d/0x50 net/socket.c:1988
ip_cmsg_send seems to forget to free ipc->opt when it returns an error
(all callers expect that there is nothing to cleanup if it returns an
error).
On commit 34229b277480f46c1e9a19f027f30b074512e68b.
