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intel, gma500, lvds: Fix use after free and mem leak in psb_intel_lvds_init()

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In psb_intel_lvds_init(), if we fail to allocate memory for
'psb_intel_connector' we free the memory we previously allocated for
'psb_intel_encoder', but we then proceed to use that free'd pointer
when we do 'psb_intel_encoder->dev_priv = lvds_priv;'.

We may also leak the memory we allocated for 'psb_intel_encoder' if we
'goto failed_connector;' and the variable goes out of scope.

While I was there anyway, I also removed the pointless 'if
(psb_intel_connector)' before freeing it at the 'failed_connector:'
label - kfree() deals gracefully with NULL pointers, so it is not
needed.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jesper Juhl 2012-03-08 16:00:58 +00:00 committed by Dave Airlie
parent 05442e5e1f
commit aa7c62af10
1 changed files with 4 additions and 5 deletions
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9
drivers/gpu/drm/gma500/psb_intel_lvds.c
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@ -713,7 +713,6 @@ void psb_intel_lvds_init(struct drm_device *dev,
psb_intel_encoder =
kzalloc(sizeof(struct psb_intel_encoder), GFP_KERNEL);
if (!psb_intel_encoder) {
dev_err(dev->dev, "psb_intel_encoder allocation error\n");
return;
@ -721,10 +720,9 @@ void psb_intel_lvds_init(struct drm_device *dev,
psb_intel_connector =
kzalloc(sizeof(struct psb_intel_connector), GFP_KERNEL);
if (!psb_intel_connector) {
kfree(psb_intel_encoder);
dev_err(dev->dev, "psb_intel_connector allocation error\n");
goto failed_encoder;
}
lvds_priv = kzalloc(sizeof(struct psb_intel_lvds_priv), GFP_KERNEL);
@ -862,7 +860,8 @@ failed_blc_i2c:
drm_encoder_cleanup(encoder);
drm_connector_cleanup(connector);
failed_connector:
if (psb_intel_connector)
kfree(psb_intel_connector);
kfree(psb_intel_connector);
failed_encoder:
kfree(psb_intel_encoder);
}