[syzbot] memory leak in airspy_probe

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 20cf903a0c40 Merge tag 'for-6.0/dm-changes-2' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14fbfa46080000
kernel config: https://syzkaller.appspot.com/x/.config?x=9f3121e03e34975
dashboard link: https://syzkaller.appspot.com/bug?extid=bb25f85e5aa482864dc0
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15cb43fa080000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=165877f2080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bb25f8...@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810afb7300 (size 128):
comm "kworker/0:1", pid 44, jiffies 4294946315 (age 14.410s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff8316980e>] kmalloc include/linux/slab.h:600 [inline]
[<ffffffff8316980e>] kzalloc include/linux/slab.h:733 [inline]
[<ffffffff8316980e>] airspy_probe+0x8e/0x200 drivers/media/usb/airspy/airspy.c:981
[<ffffffff82d83457>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
[<ffffffff8277ff2d>] call_driver_probe drivers/base/dd.c:530 [inline]
[<ffffffff8277ff2d>] really_probe+0x12d/0x390 drivers/base/dd.c:609
[<ffffffff8278024f>] __driver_probe_device+0xbf/0x140 drivers/base/dd.c:748
[<ffffffff827802fa>] driver_probe_device+0x2a/0x120 drivers/base/dd.c:778
[<ffffffff82780c46>] __device_attach_driver+0xf6/0x140 drivers/base/dd.c:901
[<ffffffff8277d127>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:427
[<ffffffff827806d2>] __device_attach+0x102/0x2d0 drivers/base/dd.c:973
[<ffffffff8277ed96>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:487
[<ffffffff8277b152>] device_add+0x642/0xe60 drivers/base/core.c:3517
[<ffffffff82d80892>] usb_set_configuration+0x8f2/0xb80 drivers/usb/core/message.c:2170
[<ffffffff82d9121c>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238
[<ffffffff82d82b2c>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293
[<ffffffff8277ff2d>] call_driver_probe drivers/base/dd.c:530 [inline]
[<ffffffff8277ff2d>] really_probe+0x12d/0x390 drivers/base/dd.c:609
[<ffffffff8278024f>] __driver_probe_device+0xbf/0x140 drivers/base/dd.c:748
[<ffffffff827802fa>] driver_probe_device+0x2a/0x120 drivers/base/dd.c:778



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[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+bb25f8...@syzkaller.appspotmail.com

Tested on:

commit: ffcf9c57 x86: link vdso and boot with -z noexecstack -..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git --
console output: https://syzkaller.appspot.com/x/log.txt?x=140a1353080000
kernel config: https://syzkaller.appspot.com/x/.config?x=181546538a43e305

dashboard link: https://syzkaller.appspot.com/bug?extid=bb25f85e5aa482864dc0
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

patch: https://syzkaller.appspot.com/x/patch.diff?x=15792e35080000

Note: testing is done by a robot and is best-effort only.