drm/radeon: fix a bogus kfree

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@research.bell-labs.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Cc: CAI Qian <caiqian@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/r600_cs.c b/drivers/gpu/drm/radeon/r600_cs.c
index 211c40252fe0c52140fc6e1a431d4001bc6a6c18..1a8594b00bd49c2896067d2fb6b2e29b8b396f4b 100644 (file)
--- 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 radeon_cs_parser *parser, int error)
        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);