avfilter/vf_blurdetect: fix uninitialized variables and possible div by zero

Thilo Borgmann committed 4 years ago

Commit 79286d31 parent 39f22df1 file · +2 −1Browse files

Showing the changes to libavfilter (1 of 1 file). Show all

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libavfilter/vf_blurdetect.c+2−1

@@ -138,6 +138,7 @@ static float edge_width(BLRContext *blr, int i, int j, int8_t dir, int w, int h, · 137 unmodified lines
138	138	case DIRECTION_VERTICAL: dX = 0; dY = 1; break;
139	139	case DIRECTION_45UP: dX = 1; dY = -1; break;
140	140	case DIRECTION_45DOWN: dX = 1; dY = 1; break;
	141	+ default: dX = 1; dY = 1; break;
141	142	}
142	143
143	144	// determines if search in direction dX/dY is looking for a maximum or minimum
@@ -227,7 +228,7 @@ static float calculate_blur(BLRContext *s, int w, int h, int hsub, int vsub, · 83 unmodified lines
227	228	}
228	229	}
229	230	// if not enough edge pixels in a block, consider it smooth
230		− if (block_total_width >= 2) {
	231	+ if (block_total_width >= 2 && block_count) {
231	232	blks[blkcnt] = block_total_width / block_count;
232	233	blkcnt++;
233	234	}