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authorMounir IDRASSI <mounir.idrassi@idrix.fr>2015-07-13 14:18:40 (GMT)
committerMounir IDRASSI <mounir.idrassi@idrix.fr>2015-07-13 21:35:20 (GMT)
commit103018b367108b2ffce9a4b7f91f3c07cd41c492 (patch)
tree254d859d8b9c2d387fbfd532aa0ee18c7d75b531 /src/Common
parent52146825de865a2be55bf087f380c3bd0f3182fc (diff)
downloadVeraCrypt-103018b367108b2ffce9a4b7f91f3c07cd41c492.zip
VeraCrypt-103018b367108b2ffce9a4b7f91f3c07cd41c492.tar.gz
Windows: Fix memory access issues when processing language XML files. Avoid writing to locked memory resource which can trigger crash.
Diffstat (limited to 'src/Common')
-rw-r--r--src/Common/Language.c63
1 files changed, 53 insertions, 10 deletions
diff --git a/src/Common/Language.c b/src/Common/Language.c
index e5b7a31..049bbb0 100644
--- a/src/Common/Language.c
+++ b/src/Common/Language.c
@@ -32,12 +32,14 @@ BOOL LocalizationActive;
int LocalizationSerialNo;
wchar_t UnknownString[1024];
-static char *LanguageFileBuffer;
+static char *LanguageFileBuffer = NULL;
static HANDLE LanguageFileFindHandle = INVALID_HANDLE_VALUE;
static char PreferredLangId[6];
-static char *LanguageResource;
-static char *HeaderResource[2];
-static char ActiveLangPackVersion[6];
+static char *LanguageResource = NULL;
+static DWORD LanguageResourceSize = 0;
+static char *HeaderResource[2] = {NULL, NULL};
+static DWORD HeaderResourceSize[2] = {0, 0};
+static char ActiveLangPackVersion[6] = {0};
static char *MapFirstLanguageFile ()
{
@@ -47,14 +49,31 @@ static char *MapFirstLanguageFile ()
LanguageFileFindHandle = INVALID_HANDLE_VALUE;
}
+ if (LanguageFileBuffer != NULL)
+ {
+ free (LanguageFileBuffer);
+ LanguageFileBuffer = NULL;
+ }
+
if (LanguageResource == NULL)
{
DWORD size;
LanguageResource = MapResource ("Xml", IDR_LANGUAGE, &size);
- LanguageResource[size - 1] = 0;
+ if (LanguageResource)
+ LanguageResourceSize = size;
}
- return LanguageResource;
+ if (LanguageResource)
+ {
+ LanguageFileBuffer = malloc(LanguageResourceSize + 1);
+ if (LanguageFileBuffer)
+ {
+ memcpy (LanguageFileBuffer, LanguageResource, LanguageResourceSize);
+ LanguageFileBuffer[LanguageResourceSize] = 0;
+ }
+ }
+
+ return LanguageFileBuffer;
}
@@ -66,6 +85,13 @@ static char *MapNextLanguageFile ()
DWORD read;
BOOL bStatus;
+ /* free memory here to avoid leaks */
+ if (LanguageFileBuffer != NULL)
+ {
+ free (LanguageFileBuffer);
+ LanguageFileBuffer = NULL;
+ }
+
if (LanguageFileFindHandle == INVALID_HANDLE_VALUE)
{
GetModuleFileNameW (NULL, f, sizeof (f) / sizeof (f[0]));
@@ -84,9 +110,9 @@ static char *MapNextLanguageFile ()
return NULL;
}
+ if (LanguageFileFindHandle == INVALID_HANDLE_VALUE) return NULL;
if (find.nFileSizeHigh != 0) return NULL;
- if (LanguageFileBuffer != NULL) free (LanguageFileBuffer);
LanguageFileBuffer = malloc(find.nFileSizeLow + 1);
if (LanguageFileBuffer == NULL) return NULL;
@@ -95,6 +121,7 @@ static char *MapNextLanguageFile ()
if (t == NULL)
{
free(LanguageFileBuffer);
+ LanguageFileBuffer = NULL;
return NULL;
}
@@ -105,6 +132,7 @@ static char *MapNextLanguageFile ()
if (file == INVALID_HANDLE_VALUE)
{
free(LanguageFileBuffer);
+ LanguageFileBuffer = NULL;
return NULL;
}
@@ -113,6 +141,7 @@ static char *MapNextLanguageFile ()
if (!bStatus || (read != find.nFileSizeLow))
{
free(LanguageFileBuffer);
+ LanguageFileBuffer = NULL;
return NULL;
}
@@ -126,7 +155,7 @@ BOOL LoadLanguageFile ()
{
DWORD size;
BYTE *res;
- char *xml, *header;
+ char *xml, *header, *headerPtr;
char langId[6] = "en", attr[32768], key[128];
BOOL defaultLangParsed = FALSE, langFound = FALSE;
WCHAR wattr[32768];
@@ -311,10 +340,22 @@ BOOL LoadLanguageFile ()
if (HeaderResource[i] == NULL)
{
HeaderResource[i] = MapResource ("Header", headers[i], &size);
- *(HeaderResource[i] + size - 1) = 0;
+ if (HeaderResource[i])
+ HeaderResourceSize[i] = size;
}
- header = HeaderResource[i];
+ headerPtr = NULL;
+ if (HeaderResource[i])
+ {
+ headerPtr = (char*) malloc (HeaderResourceSize[i] + 1);
+ if (headerPtr)
+ {
+ memcpy (headerPtr, HeaderResource[i], HeaderResourceSize[i]);
+ headerPtr [HeaderResourceSize[i]] = 0;
+ }
+ }
+
+ header = headerPtr;
if (header == NULL) return FALSE;
do
@@ -328,6 +369,8 @@ BOOL LoadLanguageFile ()
}
} while ((header = strchr (header, '\n') + 1) != (char *) 1);
+
+ free (headerPtr);
}
return TRUE;