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Exhumed: Always perform a range check on a sequence's length.

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Too many of these are not correct and prone to overflows so ignoring this is not good.
This commit is contained in:
Christoph Oelckers 2023-11-05 14:42:41 +01:00
parent 8dfb21636a
commit 1cb15ed878
2 changed files with 7 additions and 3 deletions
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8
source/games/exhumed/src/sequence.cpp
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@ -450,7 +450,7 @@ void seq_PlotArrowSequence(const int nSprite, const FName seqFile, const int16_t
//
//---------------------------------------------------------------------------
void seq_PlotSequence(const int nSprite, const FName seqFile, const int16_t seqIndex, const int16_t frameIndex, const int16_t nFlags)
void seq_PlotSequence(const int nSprite, const FName seqFile, const int seqIndex, int frameIndex, const int nFlags)
{
tspritetype* pTSprite = mytspriteArray->get(nSprite);
const auto pPlayer = getPlayer(nLocalPlayer);
@ -464,7 +464,11 @@ void seq_PlotSequence(const int nSprite, const FName seqFile, const int16_t seqI
}
const auto fileSeqs = getFileSeqs(seqFile);
const auto& seqFrame = fileSeqs->Data(seqIndex + seqOffset)->frames[frameIndex];
if (seqIndex + seqOffset > fileSeqs->SSize()) return;
const auto& sequence = fileSeqs->Data(seqIndex + seqOffset);
if (sequence->frames.SSize() <= frameIndex) frameIndex = sequence->frames.SSize() - 1;
const auto& seqFrame = sequence->frames[frameIndex];
const auto chunkCount = seqFrame.chunks.Size();
const auto nShade = pTSprite->shade - (100 * !!(fileSeqs->Data(seqIndex)->frames[frameIndex].flags & 4));

2
source/games/exhumed/src/sequence.h
View file

@ -80,7 +80,7 @@ extern int16_t nPilotLightCount;
void seq_LoadSequences();
void seq_DrawGunSequence(const SeqFrame& seqFrame, double xPos, double yPos, int nShade, int nPal, DAngle nAngle, double nAlpha, int nStat = 0);
void seq_PlotSequence(const int nSprite, const FName seqFile, const int16_t seqIndex, const int16_t frameIndex, const int16_t nFlags);
void seq_PlotSequence(const int nSprite, const FName seqFile, const int seqIndex, int frameIndex, const int nFlags);
void seq_PlotArrowSequence(const int nSprite, const FName seqFile, const int16_t seqIndex, const int frameIndex);
void seq_DrawPilotLightSeq(double xPos, double yPos, double nAngle);