Re: [PATCH] framebuffer: fix screen corruption when copying

[Tomi Valkeinen]

On 16/09/14 19:38, Mikulas Patocka wrote:
> The function bitcpy_rev has a bug that may result in screen corruption.
> The bug happens under these conditions:
> * the end of the destination area of a copy operation is aligned on a long
>   word boundary
> * the end of the source area is not aligned on a long word boundary
> * we are copying more than one long word
> 
> In this case, the variable shift is non-zero and the variable first is
> zero. The statements FB_WRITEL(comp(d0, FB_READL(dst), first), dst) reads
> the last long word of the destination and writes it back unchanged
> (because first is zero). Correctly, we should write the variable d0 to the
> last word of the destination in this case.
> 
> This patch fixes the bug by introducing and extra test if first is zero.
> 
> The patch also removes the references to fb_memmove in the code that is
> commented out because fb_memmove was removed from framebuffer subsystem.

Thanks, queued for 3.18.

 Tomi

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