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ffi: reject non-leading buffer args in fast trampolines #67045

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ffi: reject non-leading buffer args in fast trampolines #67045

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5 changes: 5 additions & 0 deletions src/ffi/platforms/arm64.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -243,6 +243,11 @@ extern "C" bool node_ffi_create_fast_trampoline(
if (IsFloatType(args[i])) {
fp_count++;
} else {
// The buffer helper call clobbers target registers already loaded for
// earlier arguments, so only a leading buffer argument is supported.
if (IsPointerValueType(args[i]) && gp_count != 0) {
return false;
}
gp_count++;
has_buffer_args = has_buffer_args || IsPointerValueType(args[i]);
}
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5 changes: 5 additions & 0 deletions src/ffi/platforms/x64.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -367,6 +367,11 @@ extern "C" bool node_ffi_create_fast_trampoline(
if (IsFloatType(args[i])) {
fp_count++;
} else {
// The buffer helper call clobbers target registers already loaded for
// earlier arguments, so only a leading buffer argument is supported.
if (IsPointerValueType(args[i]) && gp_count != 0) {
return false;
}
gp_count++;
has_buffer_args = has_buffer_args || IsPointerValueType(args[i]);
}
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