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[libpng17] Allow calling png_get_IHDR() with NULL arguments (Reuben Hawkins).

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This commit is contained in:
Glenn Randers-Pehrson
2015-01-02 08:23:24 -06:00
parent ae31a1ebdb
commit 9c078fb7d2
5 changed files with 43 additions and 33 deletions
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18
pngget.c
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@@ -799,14 +799,20 @@ png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr,
{
png_debug1(1, "in %s retrieval function", "IHDR");
if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
height == NULL || bit_depth == NULL || color_type == NULL)
if (png_ptr == NULL || info_ptr == NULL)
return (0);
*width = info_ptr->width;
*height = info_ptr->height;
*bit_depth = info_ptr->bit_depth;
*color_type = info_ptr->color_type;
if (width != NULL)
*width = info_ptr->width;
if (height != NULL)
*height = info_ptr->height;
if (bit_depth != NULL)
*bit_depth = info_ptr->bit_depth;
if (color_type != NULL)
*color_type = info_ptr->color_type;
if (compression_type != NULL)
*compression_type = info_ptr->compression_type;