| commit | 4f3a39ba7925fe83d75e0bc7a2c65a200e55f0e4 | [log] [tgz] |
|---|---|---|
| author | 许杰友 Jieyou Xu (Joe) <39484203+jieyouxu@users.noreply.github.com> | Mon Apr 15 16:56:19 2024 +0100 |
| committer | GitHub <noreply@github.com> | Mon Apr 15 16:56:19 2024 +0100 |
| tree | 5ed1c801a25da3303a69e18c92f28dec56813f4c | |
| parent | 5580ae979579c7ca19b7fd5c55f7f82914ac4d5c [diff] | |
| parent | bf3deccdadffbd5903268cca74a60f7101f7e9c3 [diff] |
Rollup merge of #123941 - Mark-Simulacrum:fix-llvm-ub, r=nikic Fix UB in LLVM FFI when passing zero or >1 bundle Rust passes a `*const &OperandBundleDef` to these APIs, usually from a `Vec<&OperandBundleDef>` or so. Previously we were dereferencing that pointer and passing it to the ArrayRef constructor with some length (N). This meant that if the length was 0, we were dereferencing a pointer to nowhere (if the vector on the Rust side didn't actually get allocated or so), and if the length was >1 then loading the *second* element somewhere in LLVM would've been reading past the end. Since Rust can't hold OperandBundleDef by-value we're forced to indirect through a vector that copies out the OperandBundleDefs from the by-reference list on the Rust side in order to match the LLVM expected API.
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