From 2d598cd7523cba7ee8441fac96bfe422ec277efc Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Thu, 24 Feb 2022 22:26:02 +0100 Subject: [PATCH] (CVE-2022-0865) tif_jbig.c: fix crash when reading a file with multiple IFD in memory-mapped mode and when bit reversal is needed (fixes #385) (cherry picked from commit a1c933dabd0e1c54a412f3f84ae0aa58115c6067) --- libtiff/tif_jbig.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/libtiff/tif_jbig.c b/libtiff/tif_jbig.c index 8136c77b..698428f0 100644 --- a/libtiff/tif_jbig.c +++ b/libtiff/tif_jbig.c @@ -210,6 +210,16 @@ int TIFFInitJBIG(TIFF* tif, int scheme) */ tif->tif_flags |= TIFF_NOBITREV; tif->tif_flags &= ~TIFF_MAPPED; + /* We may have read from a previous IFD and thus set TIFF_BUFFERMMAP and + * cleared TIFF_MYBUFFER. It is necessary to restore them to their initial + * value to be consistent with the state of a non-memory mapped file. + */ + if (tif->tif_flags&TIFF_BUFFERMMAP) { + tif->tif_rawdata = NULL; + tif->tif_rawdatasize = 0; + tif->tif_flags &= ~TIFF_BUFFERMMAP; + tif->tif_flags |= TIFF_MYBUFFER; + } /* Setup the function pointers for encode, decode, and cleanup. */ tif->tif_setupdecode = JBIGSetupDecode;