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Teach "tiffinfo -D" to not try to print image data inside an EXIF subdirectory,
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because there isn't any. Back-patched from an upstream 4.0.2 fix.
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This is not a security issue in itself (it crashes, but with a simple NULL
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pointer dereference). However, our test case for CVE-2012-5581 tickles this
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bug, so it seems easier to fix this than make a new test case.
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diff -Naur tiff-3.9.4.orig/tools/tiffinfo.c tiff-3.9.4/tools/tiffinfo.c
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--- tiff-3.9.4.orig/tools/tiffinfo.c 2010-06-08 14:50:44.000000000 -0400
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+++ tiff-3.9.4/tools/tiffinfo.c 2012-12-11 16:33:17.062228558 -0500
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@@ -49,7 +49,7 @@
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int stoponerr = 1; /* stop on first read error */
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static void usage(void);
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-static void tiffinfo(TIFF*, uint16, long);
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+static void tiffinfo(TIFF*, uint16, long, int);
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int
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main(int argc, char* argv[])
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@@ -124,19 +124,20 @@
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if (tif != NULL) {
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if (dirnum != -1) {
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if (TIFFSetDirectory(tif, (tdir_t) dirnum))
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- tiffinfo(tif, order, flags);
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+ tiffinfo(tif, order, flags, 1);
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} else if (diroff != 0) {
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if (TIFFSetSubDirectory(tif, diroff))
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- tiffinfo(tif, order, flags);
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+ tiffinfo(tif, order, flags, 1);
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} else {
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do {
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uint32 offset;
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- tiffinfo(tif, order, flags);
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+ tiffinfo(tif, order, flags, 1);
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if (TIFFGetField(tif, TIFFTAG_EXIFIFD,
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&offset)) {
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- if (TIFFReadEXIFDirectory(tif, offset))
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- tiffinfo(tif, order, flags);
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+ if (TIFFReadEXIFDirectory(tif, offset)) {
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+ tiffinfo(tif, order, flags, 0);
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+ }
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}
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} while (TIFFReadDirectory(tif));
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}
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@@ -426,10 +427,10 @@
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}
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static void
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-tiffinfo(TIFF* tif, uint16 order, long flags)
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+tiffinfo(TIFF* tif, uint16 order, long flags, int is_image)
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{
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TIFFPrintDirectory(tif, stdout, flags);
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- if (!readdata)
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+ if (!readdata || !is_image)
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return;
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if (rawdata) {
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if (order) {
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