From aa7c62af10b6ba7f0496ee3a1a760ad216426720 Mon Sep 17 00:00:00 2001 From: Jesper Juhl Date: Thu, 8 Mar 2012 16:00:58 +0000 Subject: [PATCH] intel, gma500, lvds: Fix use after free and mem leak in psb_intel_lvds_init() 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 Signed-off-by: Alan Cox Signed-off-by: Dave Airlie --- drivers/gpu/drm/gma500/psb_intel_lvds.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/gma500/psb_intel_lvds.c b/drivers/gpu/drm/gma500/psb_intel_lvds.c index 69a96513752f..c83f5b5d1057 100644 --- a/drivers/gpu/drm/gma500/psb_intel_lvds.c +++ b/drivers/gpu/drm/gma500/psb_intel_lvds.c @@ -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); } -- 2.30.2