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SubjectUBSAN: Undefined behaviour in net/ipv4/ip_output.c
I'm reporting a bug in linux-5.0-rc2: "UBSAN: Undefined behaviour in
net/ipv4/ip_output.c"

kernel config: https://kt0755.github.io/etc/config-5.0-rc2
repro: https://kt0755.github.io/etc/repro.b6a11.c

Integer overflow happened in __ip_append_data() when 2 * sk->sk_sndbuf
(at line 1004)
is larger than the boundary of the destination (i.e., int).
Some sanity check code right before it would help.

=========================================
UBSAN: Undefined behaviour in net/ipv4/ip_output.c:1004:11
signed integer overflow:
1282607372 * 2 cannot be represented in type 'int'
CPU: 0 PID: 8465 Comm: syz-executor4 Not tainted 5.0.0-rc2 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xb1/0x118 lib/dump_stack.c:113
ubsan_epilogue+0x12/0x94 lib/ubsan.c:159
handle_overflow+0x1cf/0x21a lib/ubsan.c:190
__ubsan_handle_mul_overflow+0x2a/0x35 lib/ubsan.c:214
__ip_append_data+0x30ed/0x3350 net/ipv4/ip_output.c:1004
ip_append_data.part.18+0xf3/0x170 net/ipv4/ip_output.c:1220
ip_append_data+0x63/0x80 net/ipv4/ip_output.c:1209
raw_sendmsg+0xd99/0x2b60 net/ipv4/raw.c:670
inet_sendmsg+0xfc/0x620 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xdd/0x130 net/socket.c:631
___sys_sendmsg+0x7b3/0x950 net/socket.c:2116
__sys_sendmsg+0xfc/0x1d0 net/socket.c:2154
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x83/0xc0 net/socket.c:2161
do_syscall_64+0xbe/0x4f0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4497b9
Code: e8 8c 9f 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48
89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
01 f0 ff ff 0f 83 9b 6b fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0d0100bc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0d0100c6cc RCX: 00000000004497b9
RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000013
RBP: 000000000071bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000089a0 R14: 00000000006f1a40 R15: 00007f0d0100c700
=========================================

Thanks,
Kyungtae

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