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diff --git a/devices/gdevdm24.c b/devices/gdevdm24.c
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index 4736f4f..2f610cd 100644
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--- a/devices/gdevdm24.c
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+++ b/devices/gdevdm24.c
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@@ -51,21 +51,39 @@ static void dot24_improve_bitmap (byte *, int);
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static int
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dot24_print_page (gx_device_printer *pdev, FILE *prn_stream, char *init_string, int init_len)
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{
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- int xres = (int)pdev->x_pixels_per_inch;
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- int yres = (int)pdev->y_pixels_per_inch;
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- int x_high = (xres == 360);
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- int y_high = (yres == 360);
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- int bits_per_column = (y_high ? 48 : 24);
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- uint line_size = gdev_prn_raster (pdev);
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- uint in_size = line_size * bits_per_column;
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- byte *in = (byte *) gs_malloc (pdev->memory, in_size, 1, "dot24_print_page (in)");
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- uint out_size = ((pdev->width + 7) & -8) * 3;
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- byte *out = (byte *) gs_malloc (pdev->memory, out_size, 1, "dot24_print_page (out)");
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- int y_passes = (y_high ? 2 : 1);
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- int dots_per_space = xres / 10; /* pica space = 1/10" */
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- int bytes_per_space = dots_per_space * 3;
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+ int xres;
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+ int yres;
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+ int x_high;
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+ int y_high;
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+ int bits_per_column;
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+ uint line_size;
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+ uint in_size;
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+ byte *in;
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+ uint out_size;
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+ byte *out;
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+ int y_passes;
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+ int dots_per_space;
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+ int bytes_per_space;
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int skip = 0, lnum = 0, ypass;
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+ xres = (int)pdev->x_pixels_per_inch;
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+ yres = (int)pdev->y_pixels_per_inch;
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+ x_high = (xres == 360);
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+ y_high = (yres == 360);
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+ dots_per_space = xres / 10; /* pica space = 1/10" */
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+ bytes_per_space = dots_per_space * 3;
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+ if (bytes_per_space == 0) {
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+ /* We divide by bytes_per_space later on. */
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+ return_error(gs_error_rangecheck);
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+ }
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+ bits_per_column = (y_high ? 48 : 24);
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+ line_size = gdev_prn_raster (pdev);
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+ in_size = line_size * bits_per_column;
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+ in = (byte *) gs_malloc (pdev->memory, in_size, 1, "dot24_print_page (in)");
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+ out_size = ((pdev->width + 7) & -8) * 3;
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+ out = (byte *) gs_malloc (pdev->memory, out_size, 1, "dot24_print_page (out)");
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+ y_passes = (y_high ? 2 : 1);
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+
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/* Check allocations */
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if (in == 0 || out == 0)
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{
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