Zheyu Ma 64ca7f50ad ALSA: bcd2000: Fix a UAF bug on the error path of probing ... commit ffb2759df7 upstream. When the driver fails in snd_card_register() at probe time, it will free the 'bcd2k->midi_out_urb' before killing it, which may cause a UAF bug. The following log can reveal it: [ 50.727020] BUG: KASAN: use-after-free in bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000] [ 50.727623] Read of size 8 at addr ffff88810fab0e88 by task swapper/4/0 [ 50.729530] Call Trace: [ 50.732899] bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000] Fix this by adding usb_kill_urb() before usb_free_urb(). Fixes: b47a22290d ("ALSA: MIDI driver for Behringer BCD2000 USB device") Signed-off-by: Zheyu Ma <zheyuma97@gmail.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20220715010515.2087925-1-zheyuma97@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-08-17 14:22:46 +02:00
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bcd2000.c	ALSA: bcd2000: Fix a UAF bug on the error path of probing	2022-08-17 14:22:46 +02:00
Makefile	Linux 5.2-rc6	2019-06-26 12:39:34 +01:00