DivestOS/Patches/Linux_CVEs/CVE-2017-9682/4.4/0002.patch

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2017-11-07 17:32:46 -05:00
From 1c4ddc4c7a4fcdf9371048ce01a6b0e5d2a2bae9 Mon Sep 17 00:00:00 2001
From: Sunil Khatri <sunilkh@codeaurora.org>
2017-11-07 17:32:46 -05:00
Date: Thu, 6 Apr 2017 18:28:31 +0530
Subject: msm: kgsl: Fix the race between context create and destroy
Hold the context lock before updating the context id in
param->drawctxt_id to avoid race condition between context
creation and context destroy.
Change-Id: Ic26d3e5b68078c02d15c38080b1a262ea4b1f7fe
Signed-off-by: Sunil Khatri <sunilkh@codeaurora.org>
---
drivers/gpu/msm/kgsl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/msm/kgsl.c b/drivers/gpu/msm/kgsl.c
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index 1de8e21..54f591e4 100644
--- a/drivers/gpu/msm/kgsl.c
+++ b/drivers/gpu/msm/kgsl.c
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@@ -1764,9 +1764,9 @@ long kgsl_ioctl_drawctxt_create(struct kgsl_device_private *dev_priv,
/* Commit the pointer to the context in context_idr */
write_lock(&device->context_lock);
idr_replace(&device->context_idr, context, context->id);
+ param->drawctxt_id = context->id;
write_unlock(&device->context_lock);
- param->drawctxt_id = context->id;
done:
return result;
}
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