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authorfrosch <frosch@openttd.org>2009-11-07 18:22:00 +0000
committerfrosch <frosch@openttd.org>2009-11-07 18:22:00 +0000
commit1519f7074f5f28db3b86af24c90554cc96eb64cc (patch)
tree983db9f84690dbd019bccee4bf7e596e2635c23d /src
parentc341673cd56a0101298b60592fdc1ddcd81e9f0a (diff)
downloadopenttd-1519f7074f5f28db3b86af24c90554cc96eb64cc.tar.xz
(svn r17999) -Fix: [NewGRF] Improve parsing of RIFF data. Skip unknown chunks and check chunk sizes.
Diffstat (limited to 'src')
-rw-r--r--src/newgrf.cpp53
1 files changed, 41 insertions, 12 deletions
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index f53639211..1788e52d6 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -5088,7 +5088,7 @@ static void GRFImportBlock(byte *buf, int len)
}
}
-static void LoadGRFSound(byte *buf, int len)
+static void LoadGRFSound(byte *buf, uint len)
{
byte *buf_start = buf;
@@ -5101,22 +5101,31 @@ static void LoadGRFSound(byte *buf, int len)
return;
}
- /* Size of file -- we ignore this */
- grf_load_dword(&buf);
+ uint32 total_size = grf_load_dword(&buf);
+ if (total_size > len + 8) {
+ grfmsg(1, "LoadGRFSound: RIFF was truncated");
+ return;
+ }
if (grf_load_dword(&buf) != BSWAP32('WAVE')) {
grfmsg(1, "LoadGRFSound: Invalid RIFF type");
return;
}
- for (;;) {
+ while (total_size >= 8) {
uint32 tag = grf_load_dword(&buf);
uint32 size = grf_load_dword(&buf);
+ total_size -= 8;
+ if (total_size < size) {
+ grfmsg(1, "LoadGRFSound: Invalid RIFF");
+ return;
+ }
+ total_size -= size;
switch (tag) {
case ' tmf': // 'fmt '
/* Audio format, must be 1 (PCM) */
- if (grf_load_word(&buf) != 1) {
+ if (size < 16 || grf_load_word(&buf) != 1) {
grfmsg(1, "LoadGRFSound: Invalid audio format");
return;
}
@@ -5126,8 +5135,8 @@ static void LoadGRFSound(byte *buf, int len)
grf_load_word(&buf);
sound->bits_per_sample = grf_load_word(&buf);
- /* Consume any extra bytes */
- for (; size > 16; size--) grf_load_byte(&buf);
+ /* The rest will be skipped */
+ size -= 16;
break;
case 'atad': // 'data'
@@ -5140,13 +5149,21 @@ static void LoadGRFSound(byte *buf, int len)
sound->priority = 0;
grfmsg(2, "LoadGRFSound: channels %u, sample rate %u, bits per sample %u, length %u", sound->channels, sound->rate, sound->bits_per_sample, size);
- return;
+ return; // the fmt chunk has to appear before data, so we are finished
default:
- sound->file_size = 0;
- return;
+ /* Skip unknown chunks */
+ break;
}
+
+ /* Skip rest of chunk */
+ for (; size > 0; size--) grf_load_byte(&buf);
}
+
+ grfmsg(1, "LoadGRFSound: RIFF does not contain any sound data");
+
+ /* Clear everything that was read */
+ MemSetT(sound, 0);
}
/* Action 0x12 */
@@ -5285,22 +5302,34 @@ static void TranslateGRFStrings(byte *buf, size_t len)
/* 'Action 0xFF' */
static void GRFDataBlock(byte *buf, int len)
{
+ /* <FF> <name_len> <name> '\0' <data> */
+
if (_grf_data_blocks == 0) {
grfmsg(2, "GRFDataBlock: unexpected data block, skipping");
return;
}
+ if (!check_length(len, 3, "GRFDataBlock")) return;
+
buf++;
uint8 name_len = grf_load_byte(&buf);
const char *name = (const char *)buf;
- buf += name_len + 1;
+ buf += name_len;
+
+ /* Test string termination */
+ if (grf_load_byte(&buf) != 0) {
+ grfmsg(2, "GRFDataBlock: Name not properly terminated");
+ return;
+ }
+
+ if (!check_length(len, 3 + name_len, "GRFDataBlock")) return;
grfmsg(2, "GRFDataBlock: block name '%s'...", name);
_grf_data_blocks--;
switch (_grf_data_type) {
- case GDT_SOUND: LoadGRFSound(buf, len - name_len - 2); break;
+ case GDT_SOUND: LoadGRFSound(buf, len - name_len - 3); break;
default: NOT_REACHED();
}
}