40 lines
1006 B
Diff
40 lines
1006 B
Diff
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Author: Filip Hroch <hroch@physics.muni.cz>
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Description: stack-based buffer overflow bug
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--- a/dcraw.c
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+++ b/dcraw.c
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@@ -8345,9 +8345,15 @@
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{
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UINT64 bitbuf=0;
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int vbits, col, i, c;
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- ushort img[2][2064];
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+ ushort *img;
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double sum[]={0,0};
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+#define IMG2D(row,col) \
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+ img[(row)*width+(col)]
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+
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+ img = (ushort *) malloc(2*width*sizeof(ushort));
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+ merror (img, "find_green()");
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+
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FORC(2) {
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fseek (ifp, c ? off1:off0, SEEK_SET);
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for (vbits=col=0; col < width; col++) {
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@@ -8356,13 +8362,14 @@
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for (i=0; i < bite; i+=8)
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bitbuf |= (unsigned) (fgetc(ifp) << i);
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}
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- img[c][col] = bitbuf << (64-bps-vbits) >> (64-bps);
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+ IMG2D(c,col) = bitbuf << (64-bps-vbits) >> (64-bps);
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}
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}
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FORC(width-1) {
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- sum[ c & 1] += ABS(img[0][c]-img[1][c+1]);
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- sum[~c & 1] += ABS(img[1][c]-img[0][c+1]);
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+ sum[ c & 1] += ABS(IMG2D(0,c)-IMG2D(1,c+1));
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+ sum[~c & 1] += ABS(IMG2D(1,c)-IMG2D(0,c+1));
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}
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+ free(img);
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return 100 * log(sum[0]/sum[1]);
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}
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