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-rw-r--r--src/utf8.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/src/utf8.c b/src/utf8.c
index e8f3dbdde..1b03f5d20 100644
--- a/src/utf8.c
+++ b/src/utf8.c
@@ -69,10 +69,12 @@ static char utf8_to_latin1_char(const char *inUtf8)
return (char)(c + utf8[1]);
}
-static unsigned int validateUtf8Char(const char *inUtf8Char)
+static unsigned int validateUtf8Char(const char *inUtf8Char, size_t length)
{
const unsigned char *utf8Char = (const unsigned char *)inUtf8Char;
+ assert(length > 0);
+
if (utf8Char[0] < 0x80)
return 1;
@@ -84,7 +86,7 @@ static unsigned int validateUtf8Char(const char *inUtf8Char)
t = (t >> 1);
count++;
}
- if (count > 5)
+ if (count > 5 || (size_t)count > length)
return 0;
for (i = 1; i <= count; i++) {
if (utf8Char[i] < 0x80 || utf8Char[i] > 0xBF)
@@ -95,15 +97,17 @@ static unsigned int validateUtf8Char(const char *inUtf8Char)
return 0;
}
-int validUtf8String(const char *string)
+int validUtf8String(const char *string, size_t length)
{
unsigned int ret;
- while (*string) {
- ret = validateUtf8Char(string);
+ while (length > 0) {
+ ret = validateUtf8Char(string, length);
+ assert((size_t)ret <= length);
if (0 == ret)
return 0;
string += ret;
+ length -= ret;
}
return 1;
@@ -118,7 +122,7 @@ char *utf8StrToLatin1Dup(const char *utf8)
size_t len = 0;
while (*utf8) {
- count = validateUtf8Char(utf8);
+ count = validateUtf8Char(utf8, INT_MAX);
if (!count) {
free(ret);
return NULL;
@@ -140,7 +144,7 @@ char *utf8_to_latin1(char *dest, const char *utf8)
size_t len = 0;
while (*utf8) {
- count = validateUtf8Char(utf8);
+ count = validateUtf8Char(utf8, INT_MAX);
if (count) {
*(cp++) = utf8_to_latin1_char(utf8);
utf8 += count;