================================================================== BUG: KASAN: slab-out-of-bounds in read_descriptors+0x23c/0x290 drivers/usb/core/sysfs.c:883 Read of size 2 at addr ffff0000ca3ab2aa by task udevd/3963 CPU: 1 PID: 3963 Comm: udevd Not tainted 5.15.117-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x174/0x1e4 mm/kasan/report.c:451 __asan_report_load2_noabort+0x44/0x50 mm/kasan/report_generic.c:307 read_descriptors+0x23c/0x290 drivers/usb/core/sysfs.c:883 sysfs_kf_bin_read+0x19c/0x1d4 fs/sysfs/file.c:100 kernfs_file_read_iter fs/kernfs/file.c:213 [inline] kernfs_fop_read_iter+0x32c/0x50c fs/kernfs/file.c:242 call_read_iter include/linux/fs.h:2097 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x86c/0xb10 fs/read_write.c:485 ksys_read+0x15c/0x26c fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:631 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 1528: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xbc/0xfc mm/kasan/common.c:513 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x29c/0x4c8 mm/slub.c:4407 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] usb_get_configuration+0xd8/0x4048 drivers/usb/core/config.c:882 usb_enumerate_device drivers/usb/core/hub.c:2400 [inline] usb_new_device+0x12c/0x1448 drivers/usb/core/hub.c:2538 hub_port_connect drivers/usb/core/hub.c:5358 [inline] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline] port_event drivers/usb/core/hub.c:5648 [inline] hub_event+0x22e4/0x48c4 drivers/usb/core/hub.c:5730 process_one_work+0x790/0x11b8 kernel/workqueue.c:2307 worker_thread+0x910/0x1034 kernel/workqueue.c:2454 kthread+0x37c/0x45c kernel/kthread.c:319 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 The buggy address belongs to the object at ffff0000ca3ab000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 682 bytes inside of 1024-byte region [ffff0000ca3ab000, ffff0000ca3ab400) The buggy address belongs to the page: page:00000000e42d6beb refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a3a8 head:00000000e42d6beb order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0002780 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ca3ab180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000ca3ab200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000ca3ab280: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000ca3ab300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000ca3ab380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010f9c4000 [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 96000004 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 3963 Comm: udevd Tainted: G B 5.15.117-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 pstate: a0400005 (NzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __memcpy+0x110/0x260 arch/arm64/lib/memcpy.S:158 lr : memcpy+0xc8/0xe8 mm/kasan/shadow.c:69 sp : ffff800018e27900 x29: ffff800018e27900 x28: dfff800000000000 x27: 0000000000000fdc x26: 0000000000000020 x25: ffff0000d8e59610 x24: 000000000000525a x23: ffff800016ee1000 x22: ffff80000d7216a4 x21: ffff0000ca1ce024 x20: 0000000000000000 x19: 0000000000000fdc x18: 1fffe0003690338e x17: 1fffe0003690338e x16: ffff800011952524 x15: ffff80001498f100 x14: ffff0000ca1ce024 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600019439e00 x9 : 0000000000000000 x8 : 0000000000000001 x7 : 0000000000000000 x6 : ffff800008268c6c x5 : ffff0000ca1cf000 x4 : 0000000000000fdc x3 : ffff80000d7216a4 x2 : 0000000000000fdc x1 : 0000000000000000 x0 : ffff0000ca1ce024 Call trace: __memcpy+0x110/0x260 arch/arm64/lib/memcpy.S:154 read_descriptors+0x1bc/0x290 drivers/usb/core/sysfs.c:888 sysfs_kf_bin_read+0x19c/0x1d4 fs/sysfs/file.c:100 kernfs_file_read_iter fs/kernfs/file.c:213 [inline] kernfs_fop_read_iter+0x32c/0x50c fs/kernfs/file.c:242 call_read_iter include/linux/fs.h:2097 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x86c/0xb10 fs/read_write.c:485 ksys_read+0x15c/0x26c fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:631 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Code: cb01000e b4fffc2e eb0201df 540004a3 (a940342c) ---[ end trace b85945dc2a7bcdb7 ]--- ---------------- Code disassembly (best guess): 0: cb01000e sub x14, x0, x1 4: b4fffc2e cbz x14, 0xffffffffffffff88 8: eb0201df cmp x14, x2 c: 540004a3 b.cc 0xa0 // b.lo, b.ul, b.last * 10: a940342c ldp x12, x13, [x1] <-- trapping instruction