================================================================== BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:646 [inline] BUG: KASAN: slab-use-after-free in string+0x29c/0x2c4 lib/vsprintf.c:728 Read of size 1 at addr ffff000014123340 by task udevd/10755 CPU: 1 PID: 10755 Comm: udevd Not tainted 6.7.0-rc1-syzkaller-00366-geb3479bc23fa #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x9c/0x11c arch/arm64/kernel/stacktrace.c:233 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x74/0xd4 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xd8/0x598 mm/kasan/report.c:475 kasan_report+0xc8/0x108 mm/kasan/report.c:588 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 string_nocheck lib/vsprintf.c:646 [inline] string+0x29c/0x2c4 lib/vsprintf.c:728 vsnprintf+0x430/0xf74 lib/vsprintf.c:2819 add_uevent_var+0x130/0x318 lib/kobject_uevent.c:665 dev_uevent+0x158/0x5a0 drivers/base/core.c:2576 uevent_show+0x148/0x2e8 drivers/base/core.c:2647 dev_attr_show+0x48/0xcc drivers/base/core.c:2350 sysfs_kf_seq_show+0x184/0x32c fs/sysfs/file.c:59 kernfs_seq_show+0x104/0x154 fs/kernfs/file.c:205 seq_read_iter+0x350/0xe3c fs/seq_file.c:230 kernfs_fop_read_iter+0x300/0x458 fs/kernfs/file.c:279 call_read_iter include/linux/fs.h:2014 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x488/0x6d4 fs/read_write.c:470 ksys_read+0xf0/0x1dc fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x6c/0x9c fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:51 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:136 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x58/0x140 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Allocated by task 12825: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:45 kasan_set_track+0x2c/0x40 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x34 mm/kasan/generic.c:511 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xb8/0xbc mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] kmalloc_trace+0x74/0x88 mm/slab_common.c:1103 kmalloc include/linux/slab.h:600 [inline] raw_ioctl_init+0x1e8/0x69c drivers/usb/gadget/legacy/raw_gadget.c:509 raw_ioctl+0xabc/0x2604 drivers/usb/gadget/legacy/raw_gadget.c:1303 __do_compat_sys_ioctl fs/ioctl.c:972 [inline] __se_compat_sys_ioctl fs/ioctl.c:914 [inline] __arm64_compat_sys_ioctl+0x1d4/0x220 fs/ioctl.c:914 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:51 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:136 do_el0_svc_compat+0x40/0x68 arch/arm64/kernel/syscall.c:161 el0_svc_compat+0x54/0x13c arch/arm64/kernel/entry-common.c:818 el0t_32_sync_handler+0x98/0x13c arch/arm64/kernel/entry-common.c:828 el0t_32_sync+0x194/0x198 arch/arm64/kernel/entry.S:600 Freed by task 12824: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:45 kasan_set_track+0x2c/0x40 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x120/0x1b8 mm/kasan/common.c:200 __kasan_slab_free+0x18/0x24 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook mm/slub.c:1826 [inline] slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xf0/0x354 mm/slub.c:3822 kfree+0xbc/0x1b0 mm/slab_common.c:1056 dev_free+0x80/0x5c0 drivers/usb/gadget/legacy/raw_gadget.c:211 kref_put include/linux/kref.h:65 [inline] raw_release+0x138/0x27c drivers/usb/gadget/legacy/raw_gadget.c:473 __fput+0x1a4/0x958 fs/file_table.c:394 __fput_sync+0x74/0x84 fs/file_table.c:475 __do_sys_close fs/open.c:1590 [inline] __se_sys_close fs/open.c:1575 [inline] __arm64_sys_close+0x6c/0xbc fs/open.c:1575 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:51 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:136 do_el0_svc_compat+0x40/0x68 arch/arm64/kernel/syscall.c:161 el0_svc_compat+0x54/0x13c arch/arm64/kernel/entry-common.c:818 el0t_32_sync_handler+0x98/0x13c arch/arm64/kernel/entry-common.c:828 el0t_32_sync+0x194/0x198 arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff000014123340 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of freed 32-byte region [ffff000014123340, ffff000014123360) The buggy address belongs to the physical page: page:000000004fc87238 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x54123 flags: 0x1ffc00000000800(slab|node=0|zone=0|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 01ffc00000000800 ffff000009801500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000400040 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff000014123200: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ffff000014123280: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc >ffff000014123300: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff000014123380: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ffff000014123400: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc ==================================================================