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Upstream patch for CVE-2012-4564.
diff -Naur tiff-3.9.4.orig/tools/ppm2tiff.c tiff-3.9.4/tools/ppm2tiff.c
--- tiff-3.9.4.orig/tools/ppm2tiff.c 2010-06-08 14:50:44.000000000 -0400
+++ tiff-3.9.4/tools/ppm2tiff.c 2012-12-10 16:16:05.154045877 -0500
@@ -68,6 +68,17 @@
exit(-2);
}
+static tsize_t
+multiply_ms(tsize_t m1, tsize_t m2)
+{
+ tsize_t bytes = m1 * m2;
+
+ if (m1 && bytes / m1 != m2)
+ bytes = 0;
+
+ return bytes;
+}
+
int
main(int argc, char* argv[])
{
@@ -85,6 +96,7 @@
int c;
extern int optind;
extern char* optarg;
+ tsize_t scanline_size;
if (argc < 2) {
fprintf(stderr, "%s: Too few arguments\n", argv[0]);
@@ -217,7 +229,8 @@
}
switch (bpp) {
case 1:
- linebytes = (spp * w + (8 - 1)) / 8;
+ /* if round-up overflows, result will be zero, OK */
+ linebytes = (multiply_ms(spp, w) + (8 - 1)) / 8;
if (rowsperstrip == (uint32) -1) {
TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, h);
} else {
@@ -226,15 +239,31 @@
}
break;
case 8:
- linebytes = spp * w;
+ linebytes = multiply_ms(spp, w);
TIFFSetField(out, TIFFTAG_ROWSPERSTRIP,
TIFFDefaultStripSize(out, rowsperstrip));
break;
}
- if (TIFFScanlineSize(out) > linebytes)
+ if (linebytes == 0) {
+ fprintf(stderr, "%s: scanline size overflow\n", infile);
+ (void) TIFFClose(out);
+ exit(-2);
+ }
+ scanline_size = TIFFScanlineSize(out);
+ if (scanline_size == 0) {
+ /* overflow - TIFFScanlineSize already printed a message */
+ (void) TIFFClose(out);
+ exit(-2);
+ }
+ if (scanline_size < linebytes)
buf = (unsigned char *)_TIFFmalloc(linebytes);
else
- buf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(out));
+ buf = (unsigned char *)_TIFFmalloc(scanline_size);
+ if (buf == NULL) {
+ fprintf(stderr, "%s: Not enough memory\n", infile);
+ (void) TIFFClose(out);
+ exit(-2);
+ }
if (resolution > 0) {
TIFFSetField(out, TIFFTAG_XRESOLUTION, resolution);
TIFFSetField(out, TIFFTAG_YRESOLUTION, resolution);
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