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drm/i915/display: Do not zero past infoframes.vsc

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commit 07b72960d2b4a087ff2445e286159e69742069cc upstream.

intel_dp_vsc_sdp_unpack() was using a memset() size (36, struct dp_sdp)
larger than the destination (24, struct drm_dp_vsc_sdp), clobbering
fields in struct intel_crtc_state after infoframes.vsc. Use the actual
target size for the memset().

Fixes: 1b404b7dbb10 ("drm/i915/dp: Read out DP SDPs")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210617213301.1824728-1-keescook@chromium.org
(cherry picked from commit c88e2647c5bb45d04dc4302018ebe6ebbf331823)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2021-06-17 14:33:01 -07:00 committed by Greg Kroah-Hartman
parent 8abf5eec0e
commit 3f9c2a058e
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/display/intel_dp.c
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@ -5080,7 +5080,7 @@ static int intel_dp_vsc_sdp_unpack(struct drm_dp_vsc_sdp *vsc,
if (size < sizeof(struct dp_sdp))
return -EINVAL;
memset(vsc, 0, size);
memset(vsc, 0, sizeof(*vsc));
if (sdp->sdp_header.HB0 != 0)
return -EINVAL;