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size CompBuffer for dot-matrix expansion in rastertoepson #1613

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size CompBuffer for dot-matrix expansion in rastertoepson #1613

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14 changes: 13 additions & 1 deletion filter/rastertoepson.c
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Original file line number Diff line number Diff line change
Expand Up @@ -298,7 +298,19 @@ StartPage(

if (header->cupsCompression || DotBytes)
{
if ((CompBuffer = calloc(2, header->cupsBytesPerLine + 1)) == NULL)
size_t comp_size; /* Size of compression buffer */

/*
* CompBuffer holds the PackBits-compressed line (up to two bytes per
* cupsBytesPerLine byte), or one byte per pixel column (cupsWidth) when
* OutputLine expands a dot-matrix row, so size it for the larger of the two.
*/

comp_size = 2 * ((size_t)header->cupsBytesPerLine + 1);
if ((size_t)header->cupsWidth >= comp_size)
comp_size = (size_t)header->cupsWidth + 1;

if ((CompBuffer = calloc(1, comp_size)) == NULL)
{
fputs("ERROR: Unable to allocate memory\n", stderr);
exit(1);
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