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BUG: KASAN: use-after-free in ip_cmsg_recv_dstaddr net/ipv4/ip_sockglue.c:167 [inline]
BUG: KASAN: use-after-free in ip_cmsg_recv_offset+0x12be/0x1390 net/ipv4/ip_sockglue.c:230
Read of size 4 at addr ffff8801d828fd60 by task syz-executor118/5771

CPU: 0 PID: 5771 Comm: syz-executor118 Not tainted 4.19.0-rc5+ #162
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 ip_cmsg_recv_dstaddr net/ipv4/ip_sockglue.c:167 [inline]
 ip_cmsg_recv_offset+0x12be/0x1390 net/ipv4/ip_sockglue.c:230
 ip_cmsg_recv include/net/ip.h:679 [inline]
 raw_recvmsg+0x71d/0x8b0 net/ipv4/raw.c:797
 inet_recvmsg+0x181/0x6d0 net/ipv4/af_inet.c:830
 sock_recvmsg_nosec net/socket.c:794 [inline]
 sock_recvmsg+0xd0/0x110 net/socket.c:801
 sock_read_iter+0x39b/0x570 net/socket.c:878
 call_read_iter include/linux/fs.h:1802 [inline]
 do_iter_readv_writev+0x77c/0xa80 fs/read_write.c:678
 do_iter_read+0x26e/0x650 fs/read_write.c:922
 compat_readv+0x1b4/0x260 fs/read_write.c:1167
 do_compat_readv+0x119/0x250 fs/read_write.c:1187
 __do_compat_sys_readv fs/read_write.c:1199 [inline]
 __se_compat_sys_readv fs/read_write.c:1195 [inline]
 __ia32_compat_sys_readv+0x74/0xb0 fs/read_write.c:1195
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f62ca9
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f7f5e1dc EFLAGS: 00000293 ORIG_RAX: 0000000000000091
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000500
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 5771:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696
 __kmalloc_reserve.isra.39+0x41/0xe0 net/core/skbuff.c:137
 __alloc_skb+0x155/0x770 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:995 [inline]
 __ip_append_data.isra.47+0x21d6/0x29b0 net/ipv4/ip_output.c:988
 ip_append_data.part.48+0xef/0x170 net/ipv4/ip_output.c:1196
 ip_append_data+0x6d/0x90 net/ipv4/ip_output.c:1185
 raw_sendmsg+0x1220/0x4380 net/ipv4/raw.c:671
 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:631
 __sys_sendto+0x3d7/0x670 net/socket.c:1788
 __do_sys_sendto net/socket.c:1800 [inline]
 __se_sys_sendto net/socket.c:1796 [inline]
 __ia32_sys_sendto+0xdf/0x1a0 net/socket.c:1796
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 5771:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x230 mm/slab.c:3813
 skb_free_head+0x99/0xc0 net/core/skbuff.c:550
 pskb_expand_head+0x3bb/0x10f0 net/core/skbuff.c:1493
 __pskb_pull_tail+0x156/0x1890 net/core/skbuff.c:1890
 pskb_may_pull include/linux/skbuff.h:2119 [inline]
 ip_cmsg_recv_dstaddr net/ipv4/ip_sockglue.c:157 [inline]
 ip_cmsg_recv_offset+0x113b/0x1390 net/ipv4/ip_sockglue.c:230
 ip_cmsg_recv include/net/ip.h:679 [inline]
 raw_recvmsg+0x71d/0x8b0 net/ipv4/raw.c:797
 inet_recvmsg+0x181/0x6d0 net/ipv4/af_inet.c:830
 sock_recvmsg_nosec net/socket.c:794 [inline]
 sock_recvmsg+0xd0/0x110 net/socket.c:801
 sock_read_iter+0x39b/0x570 net/socket.c:878
 call_read_iter include/linux/fs.h:1802 [inline]
 do_iter_readv_writev+0x77c/0xa80 fs/read_write.c:678
 do_iter_read+0x26e/0x650 fs/read_write.c:922
 compat_readv+0x1b4/0x260 fs/read_write.c:1167
 do_compat_readv+0x119/0x250 fs/read_write.c:1187
 __do_compat_sys_readv fs/read_write.c:1199 [inline]
 __se_compat_sys_readv fs/read_write.c:1195 [inline]
 __ia32_compat_sys_readv+0x74/0xb0 fs/read_write.c:1195
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

The buggy address belongs to the object at ffff8801d828fd40
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 32 bytes inside of
 512-byte region [ffff8801d828fd40, ffff8801d828ff40)
The buggy address belongs to the page:
page:ffffea000760a3c0 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea0007608a88 ffffea00075f7308 ffff8801da800940
raw: 0000000000000000 ffff8801d828f0c0 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d828fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d828fc80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff8801d828fd00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                       ^
 ffff8801d828fd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801d828fe00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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