================================================================== BUG: KASAN: slab-out-of-bounds in firmware_param_path_get+0x348/0x350 drivers/base/firmware_loader/main.c:531 Write of size 1 at addr ffff88814b2ddfff by task syz.6.1561/4161 CPU: 1 PID: 4161 Comm: syz.6.1561 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_store1_noabort+0x17/0x20 mm/kasan/report_generic.c:311 firmware_param_path_get+0x348/0x350 drivers/base/firmware_loader/main.c:531 param_attr_show+0x150/0x1b0 kernel/params.c:567 module_attr_show+0x56/0x70 kernel/params.c:886 sysfs_kf_seq_show+0x266/0x3d0 fs/sysfs/file.c:61 kernfs_seq_show+0x119/0x160 fs/kernfs/file.c:168 seq_read_iter+0x472/0xce0 fs/seq_file.c:230 kernfs_fop_read_iter+0x146/0x460 fs/kernfs/file.c:241 call_read_iter include/linux/fs.h:2212 [inline] generic_file_splice_read+0x3ea/0x5f0 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x40f/0xb40 fs/splice.c:870 do_splice_direct+0x1c2/0x2d0 fs/splice.c:979 do_sendfile+0x515/0xe20 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64 fs/read_write.c:1303 [inline] __x64_sys_sendfile64+0x199/0x1f0 fs/read_write.c:1303 x64_sys_call+0x88d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fe04d437159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe04be90028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fe04d6befa0 RCX: 00007fe04d437159 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 00007fe04d4ce06b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe04d6bf038 R14: 00007fe04d6befa0 R15: 00007fffe194f9f8 Allocated by task 0: (stack is not available) The buggy address belongs to the object at ffff88814b2dc000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 4095 bytes to the right of 4096-byte region [ffff88814b2dc000, ffff88814b2dd000) The buggy address belongs to the page: page:ffffea00052cb600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14b2d8 head:ffffea00052cb600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100043380 raw: 0000000000000000 0000000080040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 483, ts 120390750653, free_ts 120359122677 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc_trace+0x146/0x270 mm/slub.c:3272 kmalloc include/linux/slab.h:619 [inline] kzalloc include/linux/slab.h:750 [inline] kernfs_iop_get_link+0x66/0x600 fs/kernfs/symlink.c:136 pick_link+0x6ce/0xe00 fs/namei.c:-1 step_into+0xac8/0xce0 fs/namei.c:1840 open_last_lookups fs/namei.c:3563 [inline] path_openat+0xf69/0x2f80 fs/namei.c:3747 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236 do_sys_open fs/open.c:1252 [inline] __do_sys_openat fs/open.c:1268 [inline] __se_sys_openat fs/open.c:1263 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1263 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1474 [inline] free_pcp_prepare mm/page_alloc.c:1546 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536 free_unref_page+0xae/0x540 mm/page_alloc.c:3618 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5900 __free_slab+0xe5/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab+0x29/0x40 mm/slub.c:2046 __slab_free+0x211/0x290 mm/slub.c:3431 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 getname_flags+0xba/0x510 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:217 do_sys_openat2+0xeb/0x7f0 fs/open.c:1230 Memory state around the buggy address: ffff88814b2dde80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88814b2ddf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88814b2ddf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88814b2de000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88814b2de080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================