media: dvb-usb-v2: lmedm04: Improve logic checking of warm start

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commit 3d932ee27e upstream.

Warm start has no check as whether a genuine device has
connected and proceeds to next execution path.

Check device should read 0x47 at offset of 2 on USB descriptor read
and it is the amount requested of 6 bytes.

Fix for
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access as

Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Malcolm Priestley 2017-09-26 17:10:20 -04:00 • committed by Greg Kroah-Hartman

parent e5e1e153ec

commit fd31a38d26

1 changed files with 18 additions and 8 deletions

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drivers/media/usb/dvb-usb-v2/lmedm04.c

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