[syzbot] [usb?] memory leak in f_uac1_opts_c_srate_store

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 8ba098e6b6ff Merge tag 'v7.2-rc5-smb3-client-fixes' of git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=120e09b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=ba7c2d1679fb08a2
dashboard link: https://syzkaller.appspot.com/bug?extid=7cc26dd73231714cecd4
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=101d4c9e580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12000649580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7704922b2ff1/disk-8ba098e6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/15910c78a77e/vmlinux-8ba098e6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c70f2f8f4678/bzImage-8ba098e6.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7cc26d...@syzkaller.appspotmail.com

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


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