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drm/radeon: fix handling of variable sized arrays for router objects

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The table has the following format:

typedef struct _ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT         //usSrcDstTableOffset pointing to this structure
{
  UCHAR               ucNumberOfSrc;
  USHORT              usSrcObjectID[1];
  UCHAR               ucNumberOfDst;
  USHORT              usDstObjectID[1];
}ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT;

usSrcObjectID[] and usDstObjectID[] are variably sized, so we
can't access them directly.  Use pointers and update the offset
appropriately when accessing the Dst members.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2013-08-27 12:36:01 -04:00
parent acf88deb8d
commit fb93df1c2d
1 changed files with 6 additions and 3 deletions
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9
drivers/gpu/drm/radeon/radeon_atombios.c
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@ -711,13 +711,16 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
(ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT *)
(ctx->bios + data_offset +
le16_to_cpu(router_obj->asObjects[k].usSrcDstTableOffset));
u8 *num_dst_objs = (u8 *)
((u8 *)router_src_dst_table + 1 +
(router_src_dst_table->ucNumberOfSrc * 2));
u16 *dst_objs = (u16 *)(num_dst_objs + 1);
int enum_id;
router.router_id = router_obj_id;
for (enum_id = 0; enum_id < router_src_dst_table->ucNumberOfDst;
enum_id++) {
for (enum_id = 0; enum_id < (*num_dst_objs); enum_id++) {
if (le16_to_cpu(path->usConnObjectId) ==
le16_to_cpu(router_src_dst_table->usDstObjectID[enum_id]))
le16_to_cpu(dst_objs[enum_id]))
break;
}