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component(err-ctx): trap on a misaligned pointer #14626

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Merged
rvolosatovs merged 1 commit into from
Oct 9, 2026
+9 −0
Merged

component(err-ctx): trap on a misaligned pointer #14626

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3 changes: 3 additions & 0 deletions crates/wasmtime/src/runtime/component/concurrent/futures_and_streams.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4389,6 +4389,9 @@ impl Instance {

let lower_cx = &mut LowerContext::new(store, options, self);
let debug_msg_address = usize::try_from(debug_msg_address)?;
if debug_msg_address % usize::try_from(<str as ComponentType>::ALIGN32)? != 0 {
bail!("invalid debug message pointer: not aligned");
}
// Lower the string into the component's memory.
//
// Note that the "8" here is the size of a WIT `string` in linear
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6 changes: 6 additions & 0 deletions tests/misc_testsuite/component-model/async/error-context.wast
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Expand Up @@ -84,3 +84,9 @@
(component instance $A $A)
(assert_return (invoke "run" (u32.const 65528)))
(assert_trap (invoke "run" (u32.const 65532)) "invalid debug message pointer")

(component instance $A2 $A)
(assert_trap (invoke "run" (u32.const 1)) "invalid debug message pointer: not aligned")

(component instance $A3 $A)
(assert_trap (invoke "run" (u32.const 65526)) "invalid debug message pointer: not aligned")
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