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-rw-r--r--code/client/cl_main.c7
-rw-r--r--code/qcommon/files.c51
2 files changed, 40 insertions, 18 deletions
diff --git a/code/client/cl_main.c b/code/client/cl_main.c
index 12b102d..a2b93b9 100644
--- a/code/client/cl_main.c
+++ b/code/client/cl_main.c
@@ -1444,13 +1444,6 @@ void CL_NextDownload(void) {
else
s = localName + strlen(localName); // point at the nul byte
- // Make sure the server cannot make us write to non-quake3 directories.
- if(strstr(localName, "../") || strstr(localName, "..\\"))
- {
- Com_Error(ERR_DROP, "CL_NextDownload: Invalid download name %s", localName);
- return;
- }
-
CL_BeginDownload( localName, remoteName );
clc.downloadRestart = qtrue;
diff --git a/code/qcommon/files.c b/code/qcommon/files.c
index 31b9b66..7692079 100644
--- a/code/qcommon/files.c
+++ b/code/qcommon/files.c
@@ -2597,15 +2597,16 @@ we are not interested in a download string format, we want something human-reada
qboolean FS_ComparePaks( char *neededpaks, int len, qboolean dlstring ) {
searchpath_t *sp;
qboolean havepak, badchecksum;
+ char *origpos = neededpaks;
int i;
- if ( !fs_numServerReferencedPaks ) {
+ if (!fs_numServerReferencedPaks)
return qfalse; // Server didn't send any pack information along
- }
*neededpaks = 0;
- for ( i = 0 ; i < fs_numServerReferencedPaks ; i++ ) {
+ for ( i = 0 ; i < fs_numServerReferencedPaks ; i++ )
+ {
// Ok, see if we have this pak file
badchecksum = qfalse;
havepak = qfalse;
@@ -2615,6 +2616,13 @@ qboolean FS_ComparePaks( char *neededpaks, int len, qboolean dlstring ) {
continue;
}
+ // Make sure the server cannot make us write to non-quake3 directories.
+ if(strstr(fs_serverReferencedPakNames[i], "../") || strstr(fs_serverReferencedPakNames[i], "..\\"))
+ {
+ Com_Printf("WARNING: Invalid download name %s\n", fs_serverReferencedPakNames[i]);
+ continue;
+ }
+
for ( sp = fs_searchpaths ; sp ; sp = sp->next ) {
if ( sp->pack && sp->pack->checksum == fs_serverReferencedPaks[i] ) {
havepak = qtrue; // This is it!
@@ -2627,6 +2635,12 @@ qboolean FS_ComparePaks( char *neededpaks, int len, qboolean dlstring ) {
if (dlstring)
{
+ // We need this to make sure we won't hit the end of the buffer or the server could
+ // overwrite non-pk3 files on clients by writing so much crap into neededpaks that
+ // Q_strcat cuts off the .pk3 extension.
+
+ origpos += strlen(origpos);
+
// Remote name
Q_strcat( neededpaks, len, "@");
Q_strcat( neededpaks, len, fs_serverReferencedPakNames[i] );
@@ -2647,6 +2661,14 @@ qboolean FS_ComparePaks( char *neededpaks, int len, qboolean dlstring ) {
Q_strcat( neededpaks, len, fs_serverReferencedPakNames[i] );
Q_strcat( neededpaks, len, ".pk3" );
}
+
+ // Find out whether it might have overflowed the buffer and don't add this file to the
+ // list if that is the case.
+ if(strlen(origpos) + (origpos - neededpaks) >= len - 1)
+ {
+ *origpos = '\0';
+ break;
+ }
}
else
{
@@ -3209,7 +3231,7 @@ checksums to see if any pk3 files need to be auto-downloaded.
=====================
*/
void FS_PureServerSetReferencedPaks( const char *pakSums, const char *pakNames ) {
- int i, c, d;
+ int i, c, d = 0;
Cmd_TokenizeString( pakSums );
@@ -3218,30 +3240,37 @@ void FS_PureServerSetReferencedPaks( const char *pakSums, const char *pakNames )
c = MAX_SEARCH_PATHS;
}
- fs_numServerReferencedPaks = c;
-
for ( i = 0 ; i < c ; i++ ) {
fs_serverReferencedPaks[i] = atoi( Cmd_Argv( i ) );
}
- for ( i = 0 ; i < c ; i++ ) {
- if (fs_serverReferencedPakNames[i]) {
+ for (i = 0 ; i < sizeof(fs_serverReferencedPakNames) / sizeof(*fs_serverReferencedPakNames); i++)
+ {
+ if(fs_serverReferencedPakNames[i])
Z_Free(fs_serverReferencedPakNames[i]);
- }
+
fs_serverReferencedPakNames[i] = NULL;
}
+
if ( pakNames && *pakNames ) {
Cmd_TokenizeString( pakNames );
d = Cmd_Argc();
- if ( d > MAX_SEARCH_PATHS ) {
+ if(d > MAX_SEARCH_PATHS)
d = MAX_SEARCH_PATHS;
- }
+ else if(d > c)
+ d = c;
for ( i = 0 ; i < d ; i++ ) {
fs_serverReferencedPakNames[i] = CopyString( Cmd_Argv( i ) );
}
}
+
+ // ensure that there are as many checksums as there are pak names.
+ if(d < c)
+ c = d;
+
+ fs_numServerReferencedPaks = c;
}
/*