Re: [syzbot] [kernel?] memory leak in dev_set_name

[syzbot <syzbot+87ce68d9f48eca96a84a@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in device_set_deferred_probe_reason

BUG: memory leak
unreferenced object 0xffff888126289b00 (size 64):
  comm "syz.0.305", pid 7769, jiffies 4294969835
  hex dump (first 32 bytes):
    67 61 64 67 65 74 3a 20 44 65 76 69 63 65 20 6e  gadget: Device n
    6f 74 20 72 65 61 64 79 20 74 6f 20 70 72 6f 62  ot ready to prob
  backtrace (crc 2d586e63):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4696 [inline]
    slab_alloc_node mm/slub.c:4996 [inline]
    __do_kmalloc_node mm/slub.c:5413 [inline]
    __kmalloc_node_track_caller_noprof+0x40d/0x560 mm/slub.c:5545
    kvasprintf+0x6e/0xf0 lib/kasprintf.c:25
    kasprintf+0x6b/0x90 lib/kasprintf.c:59
    device_set_deferred_probe_reason+0x41/0x70 drivers/base/dd.c:235
    __dev_probe_failed+0xae/0xc0 drivers/base/core.c:5096
    dev_err_probe+0x73/0xa0 drivers/base/core.c:5156
    __driver_probe_device+0x185/0x1a0 drivers/base/dd.c:846
    driver_probe_device+0x28/0xf0 drivers/base/dd.c:898
    __driver_attach drivers/base/dd.c:1292 [inline]
    __driver_attach+0x10a/0x200 drivers/base/dd.c:1232
    bus_for_each_dev+0xb8/0x120 drivers/base/bus.c:383
    bus_add_driver+0x122/0x280 drivers/base/bus.c:763
    driver_register+0xb1/0x140 drivers/base/driver.c:174
    usb_gadget_register_driver_owner+0x69/0xe0 drivers/usb/gadget/udc/core.c:1752
    gadget_dev_desc_UDC_store+0x153/0x1e0 drivers/usb/gadget/configfs.c:300
    flush_write_buffer fs/configfs/file.c:207 [inline]
    configfs_write_iter+0x10d/0x1a0 fs/configfs/file.c:229
    new_sync_write fs/read_write.c:595 [inline]
    vfs_write+0x3ae/0x720 fs/read_write.c:687

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


Tested on:

commit:         6812ce4e Merge tag 'drm-fixes-2026-09-26' of https://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=133592c9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5006f84926c45769
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
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14146a05580000