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staging: bcm2835-audio: Fix memory corruption

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The previous commit (0adbfd46) fixed a memory leak but also freed a
block in the success case, causing a stale pointer to be used with
potentially fatal results. Only free the vchi_instance block in the
case that vchi_connect fails; once connected, the instance is
retained for subsequent connections.

Simplifying the code by removing a bunch of gotos and returning errors
directly.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Fixes: 0adbfd4694 ("staging: bcm2835-audio: fix memory leak in bcm2835_audio_open_connection()")
Cc: stable <stable@vger.kernel.org> # 4.12+
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Phil Elwell 2017-09-24 15:20:49 +01:00 committed by Greg Kroah-Hartman
parent aa444bd230
commit c97d96b4e6
1 changed files with 7 additions and 12 deletions
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19
drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
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@ -390,8 +390,7 @@ static int bcm2835_audio_open_connection(struct bcm2835_alsa_stream *alsa_stream
__func__, instance);
instance->alsa_stream = alsa_stream;
alsa_stream->instance = instance;
ret = 0; // xxx todo -1;
goto err_free_mem;
return 0;
}
/* Initialize and create a VCHI connection */
@ -401,16 +400,15 @@ static int bcm2835_audio_open_connection(struct bcm2835_alsa_stream *alsa_stream
LOG_ERR("%s: failed to initialise VCHI instance (ret=%d)\n",
__func__, ret);
ret = -EIO;
goto err_free_mem;
return -EIO;
}
ret = vchi_connect(NULL, 0, vchi_instance);
if (ret) {
LOG_ERR("%s: failed to connect VCHI instance (ret=%d)\n",
__func__, ret);
ret = -EIO;
goto err_free_mem;
kfree(vchi_instance);
return -EIO;
}
initted = 1;
}
@ -421,19 +419,16 @@ static int bcm2835_audio_open_connection(struct bcm2835_alsa_stream *alsa_stream
if (IS_ERR(instance)) {
LOG_ERR("%s: failed to initialize audio service\n", __func__);
ret = PTR_ERR(instance);
goto err_free_mem;
/* vchi_instance is retained for use the next time. */
return PTR_ERR(instance);
}
instance->alsa_stream = alsa_stream;
alsa_stream->instance = instance;
LOG_DBG(" success !\n");
ret = 0;
err_free_mem:
kfree(vchi_instance);
return ret;
return 0;
}
int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream)