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BUG: KASAN: use-after-free in siw_query_port+0x2f4/0x3d8 drivers/infiniband/sw/siw/siw_verbs.c:177
Read of size 4 at addr ffff0000cdb4c0e0 by task kworker/1:12/23939

CPU: 1 PID: 23939 Comm: kworker/1:12 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Workqueue: infiniband ib_cache_event_task
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350
 siw_query_port+0x2f4/0x3d8 drivers/infiniband/sw/siw/siw_verbs.c:177
 iw_query_port drivers/infiniband/core/device.c:2071 [inline]
 ib_query_port+0x5bc/0x740 drivers/infiniband/core/device.c:2112
 ib_cache_update+0x170/0x860 drivers/infiniband/core/cache.c:1490
 ib_cache_event_task+0xbc/0x1a0 drivers/infiniband/core/cache.c:1564
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

The buggy address belongs to the physical page:
page:0000000044a7c98b refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10db4c
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0003af5f08 ffff00019f3ad0b0 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000cdb4bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000cdb4c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000cdb4c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff0000cdb4c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000cdb4c180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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