memory leak in f_uac1_opts_c_srate_store

Status: upstream: reported C repro on 2026/08/05 03:13
Subsystems: usb
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+7cc26dd73231714cecd4@syzkaller.appspotmail.com
First crash: 8d12h, last: 8d12h
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
35a5ca8d patching 💥 memory leak in f_uac1_opts_c_srate_store 2026/08/05 07:14 2026/08/05 07:14 2026/08/05 07:14 52aa2820
7add3524 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ memory leak in f_uac1_opts_c_srate_store 2026/08/01 03:13 2026/08/01 03:13 2026/08/01 03:38 7664cf44
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] usb: gadget: f_uac1: fix memory leak in f_uac1_opts_*_store 1 (1) 2026/08/06 13:21
[syzbot] [usb?] memory leak in f_uac1_opts_c_srate_store 0 (1) 2026/08/05 03:13

Sample crash report:
2026/08/01 03:11:31 executed programs: 5
BUG: memory leak
unreferenced object 0xffff8881116a9c10 (size 8):
  comm "syz.0.19", pid 5937, jiffies 4294943638
  hex dump (first 8 bytes):
    34 00 00 00 00 00 00 00                          4.......
  backtrace (crc 1875d87):
    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
    __kmemdup_nul mm/util.c:64 [inline]
    kstrdup+0x3c/0x80 mm/util.c:84
    f_uac1_opts_c_srate_store+0xbb/0x170 drivers/usb/gadget/function/f_uac1.c:1666
    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+0x3ac/0x720 fs/read_write.c:687
    ksys_write+0xa5/0x170 fs/read_write.c:739
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xf8/0x610 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888109bd5f20 (size 8):
  comm "syz.0.20", pid 5965, jiffies 4294944214
  hex dump (first 8 bytes):
    34 00 00 00 00 00 00 00                          4.......
  backtrace (crc 1875d87):
    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
    __kmemdup_nul mm/util.c:64 [inline]
    kstrdup+0x3c/0x80 mm/util.c:84
    f_uac1_opts_c_srate_store+0xbb/0x170 drivers/usb/gadget/function/f_uac1.c:1666
    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+0x3ac/0x720 fs/read_write.c:687
    ksys_write+0xa5/0x170 fs/read_write.c:739
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xf8/0x610 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/01 03:11 upstream 8ba098e6b6ff 7664cf44 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in f_uac1_opts_c_srate_store
* Struck through repros no longer work on HEAD.