Description: CVE-2017-11110: Heap buffer overflow in ole_init 
Origin: vendor, https://build.opensuse.org/package/view_file/openSUSE:Maintenance:6985/catdoc.openSUSE_Leap_42.2_Update/CVE-2017-11110.patch?rev=d437c3be72c2e5a3516b75f4e9de6b35
Bug-Debian: https://bugs.debian.org/867717
Bug-SuSE: https://bugzilla.novell.com/show_bug.cgi?id=1047877
Forwarded: no
Author: Andreas Stieger <astieger@suse.com>
Reviewed-by: Salvatore Bonaccorso <carnil@debian.org>
Last-Update: 2017-07-20

--- a/src/ole.c
+++ b/src/ole.c
@@ -106,6 +106,11 @@ FILE* ole_init(FILE *f, void *buffer, si
 		return NULL;
 	}
  	sectorSize = 1<<getshort(oleBuf,0x1e);
+	/* CVE-2017-11110 */
+	if (sectorSize < 4) {
+		fprintf(stderr, "sectorSize < 4 not supported\n");
+		return NULL;
+	}
 	shortSectorSize=1<<getshort(oleBuf,0x20);
 
 /* Read BBD into memory */
@@ -147,7 +152,7 @@ FILE* ole_init(FILE *f, void *buffer, si
 		}
 
 		fseek(newfile, 512+mblock*sectorSize, SEEK_SET);
-		if(fread(tmpBuf+MSAT_ORIG_SIZE+(sectorSize-4)*i,
+		if(fread(tmpBuf+MSAT_ORIG_SIZE+(sectorSize-4)*i, /* >=4 for CVE-2017-11110 */
 						 1, sectorSize, newfile) != sectorSize) {
 			fprintf(stderr, "Error read MSAT!\n");
 			ole_finish();
