================================================================== BUG: KASAN: slab-use-after-free in load_firmware_cb+0x9c/0x1618 drivers/media/tuners/xc2028.c:1364 Read of size 8 at addr ffff0000f810c318 by task kworker/0:7/6431 CPU: 0 PID: 6431 Comm: kworker/0:7 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: events request_firmware_work_func Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 load_firmware_cb+0x9c/0x1618 drivers/media/tuners/xc2028.c:1364 request_firmware_work_func+0x150/0x214 drivers/base/firmware_loader/main.c:1167 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3248 process_scheduled_works kernel/workqueue.c:3329 [inline] worker_thread+0x938/0xecc kernel/workqueue.c:3409 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 10537: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4123 [inline] __kmalloc_noprof+0x2a0/0x494 mm/slub.c:4136 kmalloc_noprof include/linux/slab.h:664 [inline] tomoyo_realpath_from_path+0xc8/0x4cc security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x218/0x588 security/tomoyo/file.c:822 tomoyo_inode_getattr+0x28/0x38 security/tomoyo/tomoyo.c:123 security_inode_getattr+0xd8/0x124 security/security.c:2269 vfs_getattr fs/stat.c:173 [inline] vfs_statx+0x188/0x46c fs/stat.c:248 vfs_fstatat+0xc4/0x1b8 fs/stat.c:304 __do_sys_newfstatat fs/stat.c:468 [inline] __se_sys_newfstatat fs/stat.c:462 [inline] __arm64_sys_newfstatat+0x114/0x19c fs/stat.c:462 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 10537: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object+0x128/0x180 mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4438 [inline] kfree+0x154/0x3e0 mm/slub.c:4559 tomoyo_realpath_from_path+0x484/0x4cc security/tomoyo/realpath.c:286 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x218/0x588 security/tomoyo/file.c:822 tomoyo_inode_getattr+0x28/0x38 security/tomoyo/tomoyo.c:123 security_inode_getattr+0xd8/0x124 security/security.c:2269 vfs_getattr fs/stat.c:173 [inline] vfs_statx+0x188/0x46c fs/stat.c:248 vfs_fstatat+0xc4/0x1b8 fs/stat.c:304 __do_sys_newfstatat fs/stat.c:468 [inline] __se_sys_newfstatat fs/stat.c:462 [inline] __arm64_sys_newfstatat+0x114/0x19c fs/stat.c:462 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff0000f810c000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 792 bytes inside of freed 4096-byte region [ffff0000f810c000, ffff0000f810d000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x138108 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 05ffc00000000040 ffff0000c0002140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001ffffefff 0000000000000000 head: 05ffc00000000040 ffff0000c0002140 dead000000000122 0000000000000000 head: 0000000000000000 0000000000040004 00000001ffffefff 0000000000000000 head: 05ffc00000000003 fffffdffc3e04201 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f810c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f810c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f810c300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f810c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f810c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000005 KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000005] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 6431 Comm: kworker/0:7 Tainted: G B 6.10.0-rc7-syzkaller-gc912bf709078 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: events request_firmware_work_func pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : load_firmware_cb+0x188/0x1618 drivers/media/tuners/xc2028.c:1369 lr : load_firmware_cb+0xbc/0x1618 drivers/media/tuners/xc2028.c:1367 sp : ffff8000a2397880 x29: ffff8000a23979e0 x28: 0000000000000000 x27: ffff700014472f28 x26: 0000000000000000 x25: 1ffff00014472f4c x24: 1fffe0001f021863 x23: ffff8000a2397940 x22: dfff800000000000 x21: ffff0000d8ce8d60 x20: dfff800000000000 x19: ffff0000f810c318 x18: 1fffe000367a3dde x17: ffff80008f2dd000 x16: ffff800082f95f34 x15: 0000000000000001 x14: 1ffff000124e489c x13: 0000000000000000 x12: 0000000000000000 x11: ffff7000124e489d x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000005 x7 : 1fffe000367a3ddf x6 : ffff8000802a3bb0 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000801c9a1c x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000028 Call trace: load_firmware_cb+0x188/0x1618 drivers/media/tuners/xc2028.c:1369 request_firmware_work_func+0x150/0x214 drivers/base/firmware_loader/main.c:1167 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3248 process_scheduled_works kernel/workqueue.c:3329 [inline] worker_thread+0x938/0xecc kernel/workqueue.c:3409 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Code: 9100a380 d2d00016 d343fc08 f2fbfff6 (38746908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 9100a380 add x0, x28, #0x28 4: d2d00016 mov x22, #0x800000000000 // #140737488355328 8: d343fc08 lsr x8, x0, #3 c: f2fbfff6 movk x22, #0xdfff, lsl #48 * 10: 38746908 ldrb w8, [x8, x20] <-- trapping instruction