[syzbot] [kernel?] memory leak in dev_set_name

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 06cf61899d64 Merge tag 'x86-urgent-2026-08-08' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=124d4079580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6843f8fd2336602d
dashboard link: https://syzkaller.appspot.com/bug?extid=87ce68d9f48eca96a84a
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=134722c6580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164d4079580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e023ff6ad9bc/disk-06cf6189.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ea49527ba5df/vmlinux-06cf6189.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e3d6468d0490/bzImage-06cf6189.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+87ce68...@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810628f840 (size 16):
comm "swapper/0", pid 1, jiffies 4294937753
hex dump (first 16 bytes):
67 61 64 67 65 74 2e 30 00 00 00 00 00 00 00 00 gadget.0........
backtrace (crc 5823fe15):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4597 [inline]
slab_alloc_node mm/slub.c:4917 [inline]
__do_kmalloc_node mm/slub.c:5333 [inline]
__kmalloc_node_track_caller_noprof+0x3d3/0x570 mm/slub.c:5471
kvasprintf+0x6e/0xf0 lib/kasprintf.c:25
kvasprintf_const+0x5c/0x110 lib/kasprintf.c:49
kobject_set_name_vargs+0x40/0xd0 lib/kobject.c:274
dev_set_name+0x6d/0x90 drivers/base/core.c:3560
usb_add_gadget+0x219/0x330 drivers/usb/gadget/udc/core.c:1459
usb_add_gadget_udc_release drivers/usb/gadget/udc/core.c:1517 [inline]
usb_add_gadget_udc+0x6e/0xb0 drivers/usb/gadget/udc/core.c:1564
dummy_udc_probe+0x26c/0x2e0 drivers/usb/gadget/udc/dummy_hcd.c:1121
platform_probe+0x86/0xf0 drivers/base/platform.c:1439
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x12f/0x3a0 drivers/base/dd.c:706
__driver_probe_device+0xe9/0x1a0 drivers/base/dd.c:868
driver_probe_device+0x28/0xf0 drivers/base/dd.c:898
__device_attach_driver+0x10f/0x170 drivers/base/dd.c:1026
bus_for_each_drv+0xd2/0x130 drivers/base/bus.c:500
__device_attach+0xf9/0x290 drivers/base/dd.c:1098
device_initial_probe+0x6f/0x80 drivers/base/dd.c:1153

BUG: memory leak
unreferenced object 0xffff88810629da00 (size 256):
comm "swapper/0", pid 1, jiffies 4294937753
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 08 da 29 06 81 88 ff ff ..........).....
08 da 29 06 81 88 ff ff 80 cd 4e 83 ff ff ff ff ..).......N.....
backtrace (crc a134a33e):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4597 [inline]
slab_alloc_node mm/slub.c:4917 [inline]
__kmalloc_cache_noprof+0x356/0x440 mm/slub.c:5485
_kmalloc_noprof include/linux/slab.h:988 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
device_private_init drivers/base/core.c:3602 [inline]
device_add+0x740/0xc80 drivers/base/core.c:3653
usb_add_gadget+0x221/0x330 drivers/usb/gadget/udc/core.c:1461
usb_add_gadget_udc_release drivers/usb/gadget/udc/core.c:1517 [inline]
usb_add_gadget_udc+0x6e/0xb0 drivers/usb/gadget/udc/core.c:1564
dummy_udc_probe+0x26c/0x2e0 drivers/usb/gadget/udc/dummy_hcd.c:1121
platform_probe+0x86/0xf0 drivers/base/platform.c:1439
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x12f/0x3a0 drivers/base/dd.c:706
__driver_probe_device+0xe9/0x1a0 drivers/base/dd.c:868
driver_probe_device+0x28/0xf0 drivers/base/dd.c:898
__device_attach_driver+0x10f/0x170 drivers/base/dd.c:1026
bus_for_each_drv+0xd2/0x130 drivers/base/bus.c:500
__device_attach+0xf9/0x290 drivers/base/dd.c:1098
device_initial_probe+0x6f/0x80 drivers/base/dd.c:1153
bus_probe_device+0x3e/0xb0 drivers/base/bus.c:620
device_add+0x99f/0xc80 drivers/base/core.c:3772
platform_device_add+0x1c2/0x300 drivers/base/platform.c:762

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


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