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drm/mst: Fix error handling during MST sideband message reception

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commit 448421b5e93b9177c5698f0cf6f5e72d2995eeca upstream.

Handle any error due to partial reads, timeouts etc. to avoid parsing
uninitialized data subsequently. Also bail out if the parsing itself
fails.

Cc: Dave Airlie <airlied@redhat.com>
Cc: Lyude <lyude@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Lyude <lyude@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20170719114330.26540-2-imre.deak@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Imre Deak 2017-07-19 14:43:28 +03:00 committed by Greg Kroah-Hartman
parent af7b187fe5
commit 3383334a6c
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/drm_dp_mst_topology.c
View File

@ -2195,11 +2195,17 @@ static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
replyblock, len);
if (ret != len) {
DRM_DEBUG_KMS("failed to read a chunk\n");
DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n",
len, ret);
return;
}
ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
if (ret == false)
if (!ret) {
DRM_DEBUG_KMS("failed to build sideband msg\n");
return;
}
curreply += len;
replylen -= len;
}