25 lines
1.2 KiB
Diff
25 lines
1.2 KiB
Diff
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--- a/libtiff/tif_read.c
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+++ b/libtiff/tif_read.c
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@@ -346,7 +346,7 @@ TIFFReadEncodedStrip(TIFF* tif, uint32 strip, void* buf, tmsize_t size)
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rowsperstrip=td->td_rowsperstrip;
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if (rowsperstrip>td->td_imagelength)
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rowsperstrip=td->td_imagelength;
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- stripsperplane=((td->td_imagelength+rowsperstrip-1)/rowsperstrip);
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+ stripsperplane= TIFFhowmany_32_maxuint_compat(td->td_imagelength, rowsperstrip);
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stripinplane=(strip%stripsperplane);
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plane=(uint16)(strip/stripsperplane);
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rows=td->td_imagelength-stripinplane*rowsperstrip;
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--- a/libtiff/tiffiop.h
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+++ b/libtiff/tiffiop.h
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@@ -250,6 +250,10 @@ struct tiff {
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#define TIFFhowmany_32(x, y) (((uint32)x < (0xffffffff - (uint32)(y-1))) ? \
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((((uint32)(x))+(((uint32)(y))-1))/((uint32)(y))) : \
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0U)
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+/* Variant of TIFFhowmany_32() that doesn't return 0 if x close to MAXUINT. */
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+/* Caution: TIFFhowmany_32_maxuint_compat(x,y)*y might overflow */
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+#define TIFFhowmany_32_maxuint_compat(x, y) \
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+ (((uint32)(x) / (uint32)(y)) + ((((uint32)(x) % (uint32)(y)) != 0) ? 1 : 0))
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#define TIFFhowmany8_32(x) (((x)&0x07)?((uint32)(x)>>3)+1:(uint32)(x)>>3)
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#define TIFFroundup_32(x, y) (TIFFhowmany_32(x,y)*(y))
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#define TIFFhowmany_64(x, y) ((((uint64)(x))+(((uint64)(y))-1))/((uint64)(y)))
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