linux-kernel - [ 17/33] drm/radeon: fix a bogus kfree

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Date:	Fri, 18 Jan 2013 17:16:42 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Ilija Hadzic <ihadzic@...earch.bell-labs.com>,
	Alex Deucher <alexander.deucher@....com>,
	Shuah Khan <shuah.khan@...com>, CAI Qian <caiqian@...hat.com>
Subject: [ 17/33] drm/radeon: fix a bogus kfree

3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ilija Hadzic <ihadzic@...earch.bell-labs.com>

commit a6b7e1a02b77ab8fe8775d20a88c53d8ba55482e upstream.

parser->chunks[.].kpage[.] is not always kmalloc-ed
by the parser initialization, so parser_fini should
not try to kfree it if it didn't allocate it.

This patch fixes a kernel oops that can be provoked
in UMS mode.

Signed-off-by: Ilija Hadzic <ihadzic@...earch.bell-labs.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Shuah Khan <shuah.khan@...com>
Cc: CAI Qian <caiqian@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/radeon/r600_cs.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/radeon/r600_cs.c
+++ b/drivers/gpu/drm/radeon/r600_cs.c
@@ -2429,8 +2429,10 @@ static void r600_cs_parser_fini(struct r
 	kfree(parser->relocs);
 	for (i = 0; i < parser->nchunks; i++) {
 		kfree(parser->chunks[i].kdata);
-		kfree(parser->chunks[i].kpage[0]);
-		kfree(parser->chunks[i].kpage[1]);
+		if (parser->rdev && (parser->rdev->flags & RADEON_IS_AGP)) {
+			kfree(parser->chunks[i].kpage[0]);
+			kfree(parser->chunks[i].kpage[1]);
+		}
 	}
 	kfree(parser->chunks);
 	kfree(parser->chunks_array);


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