From 0b664ba968437715819bfe4c7ada5679d16ebbc3 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Fri, 10 Nov 2017 08:52:45 +0100
Subject: [PATCH] wildcardmatch: fix heap buffer overflow in setcharset

The code would previous read beyond the end of the pattern string if the
match pattern ends with an open bracket when the default pattern
matching function is used.

Detected by OSS-Fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4161

CVE-2017-8817

Bug: https://curl.haxx.se/docs/adv_2017-ae72.html
---
 lib/curl_fnmatch.c      |  9 +++----
 tests/data/Makefile.inc |  2 +-
 tests/data/test1163     | 52 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 7 deletions(-)
 create mode 100644 tests/data/test1163

diff --git a/lib/curl_fnmatch.c b/lib/curl_fnmatch.c
index da83393b4..8a1e106c4 100644
--- a/lib/curl_fnmatch.c
+++ b/lib/curl_fnmatch.c
@@ -133,6 +133,9 @@ static int setcharset(unsigned char **p, unsigned char *charset)
   unsigned char c;
   for(;;) {
     c = **p;
+    if(!c)
+      return SETCHARSET_FAIL;
+
     switch(state) {
     case CURLFNM_SCHS_DEFAULT:
       if(ISALNUM(c)) { /* ASCII value */
@@ -196,9 +199,6 @@ static int setcharset(unsigned char **p, unsigned char *charset)
         else
           return SETCHARSET_FAIL;
       }
-      else if(c == '\0') {
-        return SETCHARSET_FAIL;
-      }
       else {
         charset[c] = 1;
         (*p)++;
@@ -274,9 +274,6 @@ static int setcharset(unsigned char **p, unsigned char *charset)
       else if(c == ']') {
         return SETCHARSET_OK;
       }
-      else if(c == '\0') {
-        return SETCHARSET_FAIL;
-      }
       else if(ISPRINT(c)) {
         charset[c] = 1;
         (*p)++;
diff --git a/tests/data/Makefile.inc b/tests/data/Makefile.inc
index 2a2ca508a..8383d4c64 100644
--- a/tests/data/Makefile.inc
+++ b/tests/data/Makefile.inc
@@ -125,7 +125,7 @@ test1136 test1137 test1138 test1139 test1140 test1141 test1142 test1143 \
 test1144 test1145 test1146 test1147 test1148 test1149 test1150 test1151 \
 test1152 test1153 \
 \
-test1160 test1161 test1162 \
+test1160 test1161 test1162 test1163 \
 test1200 test1201 test1202 test1203 test1204 test1205 test1206 test1207 \
 test1208 test1209 test1210 test1211 test1212 test1213 test1214 test1215 \
 test1216 test1217 test1218 test1219 \
diff --git a/tests/data/test1163 b/tests/data/test1163
new file mode 100644
index 000000000..a109b511b
--- /dev/null
+++ b/tests/data/test1163
@@ -0,0 +1,52 @@
+<testcase>
+<info>
+<keywords>
+FTP
+RETR
+LIST
+wildcardmatch
+ftplistparser
+flaky
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data>
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+ftp
+</server>
+<tool>
+lib576
+</tool>
+<name>
+FTP wildcard with pattern ending with an open-bracket
+</name>
+<command>
+"ftp://%HOSTIP:%FTPPORT/fully_simulated/DOS/*[]["
+</command>
+</client>
+<verify>
+<protocol>
+USER anonymous
+PASS ftp@example.com
+PWD
+CWD fully_simulated
+CWD DOS
+EPSV
+TYPE A
+LIST
+QUIT
+</protocol>
+# 78 == CURLE_REMOTE_FILE_NOT_FOUND
+<errorcode>
+78
+</errorcode>
+</verify>
+</testcase>