From 4d6c37328f38636d5002a6f1b584ad8e6031c61c Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Sun, 31 Dec 2017 15:09:41 +0100 Subject: [PATCH] (CVE-2017-18013) libtiff/tif_print.c: TIFFPrintDirectory(): fix null pointer dereference on corrupted file. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2770 (cherry picked from commit c6f41df7b581402dfba3c19a1e3df4454c551a01) --- libtiff/tif_print.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/libtiff/tif_print.c b/libtiff/tif_print.c index 10a588ea..b9b53a0f 100644 --- a/libtiff/tif_print.c +++ b/libtiff/tif_print.c @@ -667,13 +667,13 @@ TIFFPrintDirectory(TIFF* tif, FILE* fd, long flags) #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) fprintf(fd, " %3lu: [%8I64u, %8I64u]\n", (unsigned long) s, - (unsigned __int64) td->td_stripoffset[s], - (unsigned __int64) td->td_stripbytecount[s]); + td->td_stripoffset ? (unsigned __int64) td->td_stripoffset[s] : 0, + td->td_stripbytecount ? (unsigned __int64) td->td_stripbytecount[s] : 0); #else fprintf(fd, " %3lu: [%8llu, %8llu]\n", (unsigned long) s, - (unsigned long long) td->td_stripoffset[s], - (unsigned long long) td->td_stripbytecount[s]); + td->td_stripoffset ? (unsigned long long) td->td_stripoffset[s] : 0, + td->td_stripbytecount ? (unsigned long long) td->td_stripbytecount[s] : 0); #endif } }