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Bug 1224363 - Clamp seg_lvl also in abs-value mode - r=rillian

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Even when the segment feature data is in absolute mode, it is still read as a
6-bit value with an added sign, so it could have values between -63 and +63.
Later, this signed value is used without checks as a filter level, which is
used to access an entry in an array of size MAX_LOOP_FILTER+1=64.

This patch just extends the existing clamping (that was done only to relative-
mode data) to absolute mode data, before it is blindly 'memset' in
lfi->lvl[seg][0], which was where the out-of-bound filter_value was read in
subsequent vp8_loop_filter_row_simple.
This commit is contained in:
Gerald Squelart 2015-12-03 14:14:45 +11:00
parent 090cd0d548
commit 861f436e5e
1 changed files with 1 additions and 1 deletions
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2
media/libvpx/vp8/common/loopfilter.c
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@ -141,8 +141,8 @@ void vp8_loop_filter_frame_init(VP8_COMMON *cm,
else /* Delta Value */
{
lvl_seg += mbd->segment_feature_data[MB_LVL_ALT_LF][seg];
lvl_seg = (lvl_seg > 0) ? ((lvl_seg > 63) ? 63: lvl_seg) : 0;
}
lvl_seg = (lvl_seg > 0) ? ((lvl_seg > 63) ? 63: lvl_seg) : 0;
}
if (!mbd->mode_ref_lf_delta_enabled)