blob: f23e98466f56573a49377710a9ee5934448b6d44 (
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Upstream patch for CVE-2012-4447. This also covers an out-of-bounds-read
possibility in the same file, which wasn't given a separate CVE.
diff -Naur tiff-3.9.4.orig/libtiff/tif_pixarlog.c tiff-3.9.4/libtiff/tif_pixarlog.c
--- tiff-3.9.4.orig/libtiff/tif_pixarlog.c 2010-06-08 14:50:42.000000000 -0400
+++ tiff-3.9.4/libtiff/tif_pixarlog.c 2012-12-10 15:50:14.421538317 -0500
@@ -641,6 +641,20 @@
return bytes;
}
+static tsize_t
+add_ms(tsize_t m1, tsize_t m2)
+{
+ tsize_t bytes = m1 + m2;
+
+ /* if either input is zero, assume overflow already occurred */
+ if (m1 == 0 || m2 == 0)
+ bytes = 0;
+ else if (bytes <= m1 || bytes <= m2)
+ bytes = 0;
+
+ return bytes;
+}
+
static int
PixarLogSetupDecode(TIFF* tif)
{
@@ -661,6 +675,8 @@
td->td_samplesperpixel : 1);
tbuf_size = multiply(multiply(multiply(sp->stride, td->td_imagewidth),
td->td_rowsperstrip), sizeof(uint16));
+ /* add one more stride in case input ends mid-stride */
+ tbuf_size = add_ms(tbuf_size, sizeof(uint16) * sp->stride);
if (tbuf_size == 0)
return (0);
sp->tbuf = (uint16 *) _TIFFmalloc(tbuf_size);
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