[PATCH] nouveau/bios: Fix tracking of BIOS image data

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

The code tries various methods for retreiving the BIOS data. However
it doesn't clear the bios->data pointer between the iterations.

In some cases, the shadow() method will fail and not update bios->data
at all, which will cause us to "score" the old data and incorrectly
attribute that score to the new method. This can cause double frees
later when disposing of the unused data.

Additionally, we were not freeing the data for methods that fail the
score test (we only freed when a "best" is superseeded, not when the
new method has a lower score than the exising "best"). Fix that as well.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

This was found by code inspection while chasing a different bug,
I do not hit the problem path on my machine.

 drivers/gpu/drm/nouveau/nouveau_bios.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index 80963d0..1947d61 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -273,6 +273,7 @@ bios_shadow(struct drm_device *dev)
 		mthd->score = score_vbios(bios, mthd->rw);
 		mthd->size = bios->length;
 		mthd->data = bios->data;
+		bios->data = NULL;
 	} while (mthd->score != 3 && (++mthd)->shadow);
 
 	mthd = shadow_methods;
@@ -281,7 +282,8 @@ bios_shadow(struct drm_device *dev)
 		if (mthd->score > best->score) {
 			kfree(best->data);
 			best = mthd;
-		}
+		} else
+			kfree(mthd->data);
 	} while ((++mthd)->shadow);
 
 	if (best->score) {
-- 
1.7.9.5