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video_core: Fix benign out-of-bounds indexing of array (#2553)

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The resulting pointer wasn't written to unless the index was verified as
valid, but that's still UB and triggered debug checks in MSVC.

Reported by garrettboast on IRC
This commit is contained in:
Yuri Kunde Schlesner 2017-02-10 20:51:09 -08:00 committed by GitHub
parent 2889372e47
commit e2fa1ca5e1
1 changed files with 1 additions and 2 deletions
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src/video_core/shader/shader.cpp
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@ -39,9 +39,8 @@ OutputVertex OutputVertex::FromAttributeBuffer(const RasterizerRegs& regs, Attri
for (unsigned comp = 0; comp < 4; ++comp) { for (unsigned comp = 0; comp < 4; ++comp) {
RasterizerRegs::VSOutputAttributes::Semantic semantic = semantics[comp]; RasterizerRegs::VSOutputAttributes::Semantic semantic = semantics[comp];
float24* out = &vertex_slots[semantic];
if (semantic < vertex_slots.size()) { if (semantic < vertex_slots.size()) {
*out = input.attr[i][comp]; vertex_slots[semantic] = input.attr[i][comp];
} else if (semantic != RasterizerRegs::VSOutputAttributes::INVALID) { } else if (semantic != RasterizerRegs::VSOutputAttributes::INVALID) {
LOG_ERROR(HW_GPU, "Invalid/unknown semantic id: %u", (unsigned int)semantic); LOG_ERROR(HW_GPU, "Invalid/unknown semantic id: %u", (unsigned int)semantic);
} }