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audio: fix invalid malloc size in audio_create_pdos 

The code used sizeof(AudiodevAlsaPerDirectionOptions) instead of the
appropriate per direction options for the audio backend.  If the size of
the actual audiodev's per direction options are larger than alsa's, it
could cause a buffer overflow.

However, alsa has three fields in per direction options: a string, an
uint32 and a bool.  Oss has the same fields, coreaudio has a single
uint32, paaudio has a string and an uint32, all other backends only use
the common options, so currently no per direction options struct should
be larger than alsa's.

Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com>
Message-Id: <7808bc816ba7da8b8de8a214713444d85f7af3c6.1566847960.git.DirtY.iCE.hu@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Kővágó, Zoltán 2019-08-26 21:59:01 +02:00 committed by Gerd Hoffmann
parent 23919ddfd5
commit 725662d6db
1 changed files with 1 additions and 1 deletions
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2
audio/audio.c
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@ -1685,7 +1685,7 @@ void audio_create_pdos(Audiodev *dev)
} \
if (!dev->u.driver.has_out) { \
dev->u.driver.out = g_malloc0( \
sizeof(AudiodevAlsaPerDirectionOptions)); \
sizeof(Audiodev##pdo_name##PerDirectionOptions)); \
dev->u.driver.has_out = true; \
} \
break