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BUG: KASAN: slab-out-of-bounds in sg_assign_page include/linux/scatterlist.h:131 [inline]
BUG: KASAN: slab-out-of-bounds in sg_set_page include/linux/scatterlist.h:162 [inline]
BUG: KASAN: slab-out-of-bounds in af_alg_pull_tsgl+0x1c6/0x740 crypto/af_alg.c:711
Read of size 8 at addr ffff8880203ae220 by task syz.0.7274/30506

CPU: 1 UID: 0 PID: 30506 Comm: syz.0.7274 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 sg_assign_page include/linux/scatterlist.h:131 [inline]
 sg_set_page include/linux/scatterlist.h:162 [inline]
 af_alg_pull_tsgl+0x1c6/0x740 crypto/af_alg.c:711
 _skcipher_recvmsg crypto/algif_skcipher.c:152 [inline]
 skcipher_recvmsg+0x5df/0x1140 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1072 [inline]
 sock_recvmsg+0x172/0x1b0 net/socket.c:1094
 __sys_recvfrom+0x240/0x3c0 net/socket.c:2250
 __do_sys_recvfrom net/socket.c:2265 [inline]
 __se_sys_recvfrom net/socket.c:2261 [inline]
 __x64_sys_recvfrom+0xde/0x100 net/socket.c:2261
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d2f35d04e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f9d302d2e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 00007f9d302d46c0 RCX: 00007f9d2f35d04e
RDX: 0000000000001000 RSI: 00007f9d302d3000 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000b
R13: 00007f9d302d2f58 R14: 00007f9d302d3000 R15: 0000000000000000
 </TASK>

Allocated by task 30506:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5260 [inline]
 __kmalloc_noprof+0x35c/0x760 mm/slub.c:5272
 kmalloc_noprof include/linux/slab.h:954 [inline]
 sock_kmalloc+0xd6/0x160 net/core/sock.c:2883
 _skcipher_recvmsg crypto/algif_skcipher.c:144 [inline]
 skcipher_recvmsg+0x54d/0x1140 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1072 [inline]
 sock_recvmsg+0x172/0x1b0 net/socket.c:1094
 __sys_recvfrom+0x240/0x3c0 net/socket.c:2250
 __do_sys_recvfrom net/socket.c:2265 [inline]
 __se_sys_recvfrom net/socket.c:2261 [inline]
 __x64_sys_recvfrom+0xde/0x100 net/socket.c:2261
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880203ae200
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
 allocated 32-byte region [ffff8880203ae200, ffff8880203ae220)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x203ae
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88813feac780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6729, tgid 6729 (sed), ts 106138254142, free_ts 106137778336
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3292 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3481
 new_slab mm/slub.c:3539 [inline]
 refill_objects+0x331/0x3c0 mm/slub.c:7175
 refill_sheaf mm/slub.c:2812 [inline]
 __pcs_replace_empty_main+0x2e6/0x730 mm/slub.c:4615
 alloc_from_pcs mm/slub.c:4717 [inline]
 slab_alloc_node mm/slub.c:4851 [inline]
 __kmalloc_cache_noprof+0x392/0x660 mm/slub.c:5375
 kmalloc_noprof include/linux/slab.h:950 [inline]
 slab_free_hook mm/slub.c:2637 [inline]
 slab_free mm/slub.c:6165 [inline]
 kmem_cache_free+0x15b/0x630 mm/slub.c:6295
 remove_vma mm/vma.c:470 [inline]
 vms_complete_munmap_vmas+0x929/0xc60 mm/vma.c:1342
 __mmap_complete+0x7b/0x5e0 mm/vma.c:2588
 __mmap_region mm/vma.c:2768 [inline]
 mmap_region+0x15ee/0x22a0 mm/vma.c:2844
 do_mmap+0xc39/0x10c0 mm/mmap.c:559
 vm_mmap_pgoff+0x2c9/0x4f0 mm/util.c:581
 ksys_mmap_pgoff+0x51e/0x760 mm/mmap.c:605
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5821 tgid 5821 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
 vfree+0x25a/0x400 mm/vmalloc.c:3479
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:882 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline]
 do_ip6t_get_ctl+0xf14/0x1230 net/ipv6/netfilter/ip6_tables.c:1677
 nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x1fd/0x2b0 net/ipv6/ipv6_sockglue.c:1464
 do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2422
 __sys_getsockopt net/socket.c:2453 [inline]
 __do_sys_getsockopt net/socket.c:2460 [inline]
 __se_sys_getsockopt net/socket.c:2457 [inline]
 __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2457
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8880203ae100: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
 ffff8880203ae180: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff8880203ae200: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
                               ^
 ffff8880203ae280: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff8880203ae300: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
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