linux-kernel - Re: [PATCH 049/190] Revert "agp/intel: Fix a memory leak on module initialisation failure"

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Date:   Tue, 27 Apr 2021 19:24:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Qiushi Wu <wu000273@....edu>,
        Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [PATCH 049/190] Revert "agp/intel: Fix a memory leak on module
 initialisation failure"

On Wed, Apr 21, 2021 at 02:58:44PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit b975abbd382fe442713a4c233549abb90e57c22b.
> 
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
> 
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
> 
> Cc: Qiushi Wu <wu000273@....edu>
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: https
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/char/agp/intel-gtt.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
> index 5bfdf222d5f9..4b34a5195c65 100644
> --- a/drivers/char/agp/intel-gtt.c
> +++ b/drivers/char/agp/intel-gtt.c
> @@ -304,10 +304,8 @@ static int intel_gtt_setup_scratch_page(void)
>  	if (intel_private.needs_dmar) {
>  		dma_addr = pci_map_page(intel_private.pcidev, page, 0,
>  				    PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
> -		if (pci_dma_mapping_error(intel_private.pcidev, dma_addr)) {
> -			__free_page(page);
> +		if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
>  			return -EINVAL;
> -		}
>  
>  		intel_private.scratch_page_dma = dma_addr;
>  	} else
> -- 
> 2.31.1
> 

Original looks correct, I'll drop this revert.

greg k-h