43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/**
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* Test for uninitialized color map entries
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*
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* We're reading a crafted GIF which consists of 16x16 color blocks and which
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* has only two palette entries in the global color map, but uses other palette
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* indexes as well. We verify whether all undefined palette indexes produce the
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* color black.
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*
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* See also <CAKm_7a-AO++B6cXYWM_DtycPENG5WNWK7NSEvQ5OmZziMY_JyA@mail.gmail.com>
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* which had been sent to security@libgd.org.
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*/
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#include "gd.h"
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#include "gdtest.h"
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int main()
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{
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gdImagePtr im;
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FILE *fp;
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int i, j, col;
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fp = gdTestFileOpen2("gif", "unitialized_memory_read.gif");
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gdTestAssert(fp != NULL);
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im = gdImageCreateFromGif(fp);
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gdTestAssert(im != NULL);
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fclose(fp);
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for (i = 0; i < gdImageSX(im); i += 16) {
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for (j = 0; j < gdImageSY(im); j += 16) {
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if (gdImageGetPixel(im, i, j) >= 2) {
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col = gdImageGetTrueColorPixel(im, i, j);
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gdTestAssertMsg(col == 0, "(%d,%d): expected color 0, but got %d\n", i, j, col);
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}
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}
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}
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gdImageDestroy(im);
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return gdNumFailures();
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}
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