* [PATCH] media: usb: fix memory leak in em28xx_dvb_init
@ 2021-03-27 8:26 Pavel Skripkin
[not found] ` <CAHp75VcH9BpvRLcqY_LxyiycQ-pOpZP4QrJXYKe69zUDbYG=SA@mail.gmail.com>
2021-03-27 15:09 ` [PATCH v2] " Pavel Skripkin
0 siblings, 2 replies; 3+ messages in thread
From: Pavel Skripkin @ 2021-03-27 8:26 UTC (permalink / raw)
To: mchehab
Cc: linux-media, linux-kernel, Pavel Skripkin, syzbot+889397c820fa56adf25d
syzbot reported memory leak in em28xx_dvb_init()[1]
The problem was in wrong error handling after em28xx_alloc_urbs()[2] call.
In case of error allocated urbs must be freed
backtrace:
[<ffffffff8304c141>] kmalloc_array.constprop.0+0x41/0x60 include/linux/slab.h:594
[<ffffffff8304dba2>] kcalloc include/linux/slab.h:623 [inline]
[<ffffffff8304dba2>] em28xx_alloc_urbs+0x102/0x550 drivers/media/usb/em28xx/em28xx-core.c:930 [2]
[<ffffffff84279fa7>] em28xx_dvb_init drivers/media/usb/em28xx/em28xx-dvb.c:1517 [inline] [1]
[<ffffffff84279fa7>] em28xx_dvb_init.cold+0xa3/0x2bb1 drivers/media/usb/em28xx/em28xx-dvb.c:1483
[<ffffffff8304e33b>] em28xx_init_extension+0x9b/0xe0 drivers/media/usb/em28xx/em28xx-core.c:1126
[<ffffffff83050143>] request_module_async+0x33/0x40 drivers/media/usb/em28xx/em28xx-cards.c:3406
[<ffffffff81259229>] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275
[<ffffffff81259dbb>] process_scheduled_works kernel/workqueue.c:2337 [inline]
[<ffffffff81259dbb>] worker_thread+0x2fb/0x5d0 kernel/workqueue.c:2426
[<ffffffff81261228>] kthread+0x178/0x1b0 kernel/kthread.c:292
[<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Reported-by: syzbot+889397c820fa56adf25d@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
drivers/media/usb/em28xx/em28xx-dvb.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/media/usb/em28xx/em28xx-dvb.c b/drivers/media/usb/em28xx/em28xx-dvb.c
index 526424279637..471bd74667e3 100644
--- a/drivers/media/usb/em28xx/em28xx-dvb.c
+++ b/drivers/media/usb/em28xx/em28xx-dvb.c
@@ -2010,6 +2010,7 @@ static int em28xx_dvb_init(struct em28xx *dev)
return result;
out_free:
+ em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
kfree(dvb);
dev->dvb = NULL;
goto ret;
--
2.30.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] media: usb: fix memory leak in em28xx_dvb_init
[not found] ` <CAHp75VcH9BpvRLcqY_LxyiycQ-pOpZP4QrJXYKe69zUDbYG=SA@mail.gmail.com>
@ 2021-03-27 13:43 ` Pavel Skripkin
0 siblings, 0 replies; 3+ messages in thread
From: Pavel Skripkin @ 2021-03-27 13:43 UTC (permalink / raw)
To: Andy Shevchenko
Cc: mchehab, linux-media, linux-kernel, syzbot+889397c820fa56adf25d
Hi!
On Sat, 2021-03-27 at 11:01 +0200, Andy Shevchenko wrote:
>
>
> On Saturday, March 27, 2021, Pavel Skripkin <paskripkin@gmail.com>
> wrote:
> > syzbot reported memory leak in em28xx_dvb_init()[1]
> > The problem was in wrong error handling after
> > em28xx_alloc_urbs()[2]
> > call.
> > In case of error allocated urbs must be freed
> >
> >
>
> I believe you may reduce twice the below backtrace and leave only
> important line(s).
Ok, I'll send new patch version soon.
Thank you!
>
>
> > backtrace:
> > [<ffffffff8304c141>] kmalloc_array.constprop.0+0x41/0x60
> > include/linux/slab.h:594
> > [<ffffffff8304dba2>] kcalloc include/linux/slab.h:623 [inline]
> > [<ffffffff8304dba2>] em28xx_alloc_urbs+0x102/0x550
> > drivers/media/usb/em28xx/em28xx-core.c:930 [2]
> > [<ffffffff84279fa7>] em28xx_dvb_init
> > drivers/media/usb/em28xx/em28xx-dvb.c:1517 [inline] [1]
> > [<ffffffff84279fa7>] em28xx_dvb_init.cold+0xa3/0x2bb1
> > drivers/media/usb/em28xx/em28xx-dvb.c:1483
> > [<ffffffff8304e33b>] em28xx_init_extension+0x9b/0xe0
> > drivers/media/usb/em28xx/em28xx-core.c:1126
> > [<ffffffff83050143>] request_module_async+0x33/0x40
> > drivers/media/usb/em28xx/em28xx-cards.c:3406
> > [<ffffffff81259229>] process_one_work+0x2c9/0x600
> > kernel/workqueue.c:2275
> > [<ffffffff81259dbb>] process_scheduled_works
> > kernel/workqueue.c:2337 [inline]
> > [<ffffffff81259dbb>] worker_thread+0x2fb/0x5d0
> > kernel/workqueue.c:2426
> > [<ffffffff81261228>] kthread+0x178/0x1b0 kernel/kthread.c:292
> > [<ffffffff8100227f>] ret_from_fork+0x1f/0x30
> > arch/x86/entry/entry_64.S:294
> >
> > Reported-by: syzbot+889397c820fa56adf25d@syzkaller.appspotmail.com
> > Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
> > ---
> > drivers/media/usb/em28xx/em28xx-dvb.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/media/usb/em28xx/em28xx-dvb.c
> > b/drivers/media/usb/em28xx/em28xx-dvb.c
> > index 526424279637..471bd74667e3 100644
> > --- a/drivers/media/usb/em28xx/em28xx-dvb.c
> > +++ b/drivers/media/usb/em28xx/em28xx-dvb.c
> > @@ -2010,6 +2010,7 @@ static int em28xx_dvb_init(struct em28xx
> > *dev)
> > return result;
> >
> > out_free:
> > + em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
> > kfree(dvb);
> > dev->dvb = NULL;
> > goto ret;
> > --
> > 2.30.2
> >
> >
>
>
--
With regards,
Pavel Skripkin
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH v2] media: usb: fix memory leak in em28xx_dvb_init
2021-03-27 8:26 [PATCH] media: usb: fix memory leak in em28xx_dvb_init Pavel Skripkin
[not found] ` <CAHp75VcH9BpvRLcqY_LxyiycQ-pOpZP4QrJXYKe69zUDbYG=SA@mail.gmail.com>
@ 2021-03-27 15:09 ` Pavel Skripkin
1 sibling, 0 replies; 3+ messages in thread
From: Pavel Skripkin @ 2021-03-27 15:09 UTC (permalink / raw)
To: mchehab, andy.shevchenko
Cc: linux-media, linux-kernel, Pavel Skripkin, syzbot+889397c820fa56adf25d
syzbot reported memory leak in em28xx_dvb_init()[1]
The problem was in wrong error handling after em28xx_alloc_urbs()[2] call.
In case of error allocated urbs must be freed
backtrace:
[<ffffffff8304c141>] kmalloc_array.constprop.0+0x41/0x60 include/linux/slab.h:594
[<ffffffff8304dba2>] kcalloc include/linux/slab.h:623 [inline]
[<ffffffff8304dba2>] em28xx_alloc_urbs+0x102/0x550 drivers/media/usb/em28xx/em28xx-core.c:930 [2]
[<ffffffff84279fa7>] em28xx_dvb_init drivers/media/usb/em28xx/em28xx-dvb.c:1517 [inline] [1]
Reported-by: syzbot+889397c820fa56adf25d@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
drivers/media/usb/em28xx/em28xx-dvb.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/media/usb/em28xx/em28xx-dvb.c b/drivers/media/usb/em28xx/em28xx-dvb.c
index 526424279637..471bd74667e3 100644
--- a/drivers/media/usb/em28xx/em28xx-dvb.c
+++ b/drivers/media/usb/em28xx/em28xx-dvb.c
@@ -2010,6 +2010,7 @@ static int em28xx_dvb_init(struct em28xx *dev)
return result;
out_free:
+ em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
kfree(dvb);
dev->dvb = NULL;
goto ret;
--
2.30.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-03-27 15:11 UTC | newest]
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2021-03-27 8:26 [PATCH] media: usb: fix memory leak in em28xx_dvb_init Pavel Skripkin
[not found] ` <CAHp75VcH9BpvRLcqY_LxyiycQ-pOpZP4QrJXYKe69zUDbYG=SA@mail.gmail.com>
2021-03-27 13:43 ` Pavel Skripkin
2021-03-27 15:09 ` [PATCH v2] " Pavel Skripkin
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