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From 673800fe903588164b703e0e9be04ced78492b93 Mon Sep 17 00:00:00 2001
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From: Eion Robb <eionrobb@gmail.com>
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Date: Sun, 19 Feb 2017 03:13:47 +0000
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Subject: [PATCH 1/2] Fix for crash when sending invalid xml entities separated
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by whitespace, eg "&# 3000;"
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--HG--
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branch : EionRobb/fix-for-crash-when-sending-invalid-xml-e-1487474010880
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---
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libpurple/util.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/libpurple/util.c b/libpurple/util.c
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index 9f2a904ae688..4b8fecd2ab84 100644
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--- a/libpurple/util.c
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+++ b/libpurple/util.c
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@@ -978,8 +978,8 @@ purple_markup_unescape_entity(const char *text, int *length)
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else if(IS_ENTITY("'"))
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pln = "\'";
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else if(*(text+1) == '#' &&
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- (sscanf(text, "&#%u%1[;]", £, temp) == 2 ||
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- sscanf(text, "&#x%x%1[;]", £, temp) == 2) &&
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+ (sscanf(text, "&#%*[^ ]%u%1[;]", £, temp) == 2 ||
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+ sscanf(text, "&#x%*[^ ]%x%1[;]", £, temp) == 2) &&
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pound != 0) {
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static char buf[7];
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int buflen = g_unichar_to_utf8((gunichar)pound, buf);
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--
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2.9.3
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From 4a5ebea2ad6281bd7a223d33fac3dcd2fe5cd798 Mon Sep 17 00:00:00 2001
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From: Eion Robb <eionrobb@gmail.com>
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Date: Mon, 20 Feb 2017 21:05:32 +0000
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Subject: [PATCH 2/2] Use the more robust entity processing that @dequisdequis
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came up with
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--HG--
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branch : EionRobb/fix-for-crash-when-sending-invalid-xml-e-1487474010880
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---
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libpurple/util.c | 29 ++++++++++++++++++++---------
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1 file changed, 20 insertions(+), 9 deletions(-)
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diff --git a/libpurple/util.c b/libpurple/util.c
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index 4b8fecd2ab84..cff526de0726 100644
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--- a/libpurple/util.c
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+++ b/libpurple/util.c
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@@ -977,18 +977,29 @@ purple_markup_unescape_entity(const char *text, int *length)
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pln = "\302\256"; /* or use g_unichar_to_utf8(0xae); */
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else if(IS_ENTITY("'"))
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pln = "\'";
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- else if(*(text+1) == '#' &&
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- (sscanf(text, "&#%*[^ ]%u%1[;]", £, temp) == 2 ||
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- sscanf(text, "&#x%*[^ ]%x%1[;]", £, temp) == 2) &&
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- pound != 0) {
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+ else if(text[1] == '#' && g_ascii_isxdigit(text[2])) {
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static char buf[7];
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- int buflen = g_unichar_to_utf8((gunichar)pound, buf);
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+ const char *start = text + 2;
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+ char *end;
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+ guint64 pound;
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+ int base = 10;
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+ int buflen;
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+
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+ if (*start == 'x') {
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+ base = 16;
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+ start++;
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+ }
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+
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+ pound = g_ascii_strtoull(start, &end, base);
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+ if (pound == 0 || pound > INT_MAX || *end != ';') {
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+ return NULL;
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+ }
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+
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+ len = (end - text) + 1;
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+
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+ buflen = g_unichar_to_utf8((gunichar)pound, buf);
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buf[buflen] = '\0';
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pln = buf;
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-
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- len = (*(text+2) == 'x' ? 3 : 2);
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- while(isxdigit((gint) text[len])) len++;
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- if(text[len] == ';') len++;
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}
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else
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return NULL;
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--
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2.9.3
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