memory leak in f_uac2_opts_c_srate_store

Status: upstream: reported C repro on 2026/07/31 00:11
Subsystems: usb
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+ebd045a6645cfb713c95@syzkaller.appspotmail.com
First crash: 20d, last: 2d23h
▶ ▼ ✨ AI Patch Versions (1)
Version Stage Reported Report Link Job
1 moderation 2026/07/31 08:41 Discussion cd9711f3-2259-4827-9de9-96cca016901b
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
cd9711f3 patching ❓ memory leak in f_uac2_opts_c_srate_store 2026/07/31 06:20 2026/07/31 06:20 2026/07/31 08:41 aaffb173
db5519ef assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ memory leak in f_uac2_opts_c_srate_store 2026/07/26 16:23 2026/07/26 16:23 2026/07/26 16:48 492bab15
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH] usb: gadget: f_uac2: fix memory leak in sample rate store 1 (1) 2026/08/02 03:29
[PATCH] usb: gadget: f_uac2: fix memory leak in sample rate store 1 (1) 2026/08/02 00:58
[syzbot] [usb?] memory leak in f_uac2_opts_c_srate_store 0 (2) 2026/08/02 00:04
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2026/08/12 23:36 40m retest repro upstream report job log log
2026/08/02 00:04 28m rwarwatkar@gmail.com patch upstream OK log

Sample crash report:
2026/07/26 16:23:20 executed programs: 5
BUG: memory leak
unreferenced object 0xffff888112a01e00 (size 64):
  comm "syz.0.17", pid 5945, jiffies 4294942115
  hex dump (first 32 bytes):
    34 34 31 30 30 00 34 38 30 30 30 00 38 38 32 30  44100.48000.8820
    30 00 39 36 30 30 30 00 31 37 36 34 30 30 00 31  0.96000.176400.1
  backtrace (crc 9bbd8bc9):
    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_uac2_opts_c_srate_store+0xbb/0x170 drivers/usb/gadget/function/f_uac2.c:2091
    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 0xffff8881128d2d80 (size 64):
  comm "syz.0.18", pid 5946, jiffies 4294942116
  hex dump (first 32 bytes):
    34 34 31 30 30 00 34 38 30 30 30 00 38 38 32 30  44100.48000.8820
    30 00 39 36 30 30 30 00 31 37 36 34 30 30 00 31  0.96000.176400.1
  backtrace (crc 9bbd8bc9):
    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_uac2_opts_c_srate_store+0xbb/0x170 drivers/usb/gadget/function/f_uac2.c:2091
    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 0xffff88811193ee80 (size 64):
  comm "syz.0.21", pid 5964, jiffies 4294942644
  hex dump (first 32 bytes):
    34 34 31 30 30 00 34 38 30 30 30 00 38 38 32 30  44100.48000.8820
    30 00 39 36 30 30 30 00 31 37 36 34 30 30 00 31  0.96000.176400.1
  backtrace (crc 9bbd8bc9):
    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_uac2_opts_c_srate_store+0xbb/0x170 drivers/usb/gadget/function/f_uac2.c:2091
    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
2026/07/26 16:23 upstream 3dab139d4795 492bab15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in f_uac2_opts_c_srate_store
* Struck through repros no longer work on HEAD.