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https://github.com/rust-lang/rust-clippy
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Fix temporary_cstring_as_ptr
false negative
Fixes #4375. Changes the check to test when `.unwrap().as_ptr()` is called on any `Result<CString, _>` as suggested by @flip1995 (https://github.com/rust-lang/rust-clippy/issues/4375#issuecomment-520724123).
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460e2659f1
commit
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4 changed files with 45 additions and 15 deletions
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@ -8,7 +8,6 @@ use std::iter;
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use if_chain::if_chain;
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use matches::matches;
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use rustc::hir;
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use rustc::hir::def::{DefKind, Res};
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use rustc::hir::intravisit::{self, Visitor};
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use rustc::lint::{in_external_macro, LateContext, LateLintPass, Lint, LintArray, LintContext, LintPass};
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use rustc::ty::{self, Predicate, Ty};
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@ -1668,13 +1667,12 @@ fn lint_extend(cx: &LateContext<'_, '_>, expr: &hir::Expr, args: &[hir::Expr]) {
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}
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}
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fn lint_cstring_as_ptr(cx: &LateContext<'_, '_>, expr: &hir::Expr, new: &hir::Expr, unwrap: &hir::Expr) {
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fn lint_cstring_as_ptr(cx: &LateContext<'_, '_>, expr: &hir::Expr, source: &hir::Expr, unwrap: &hir::Expr) {
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if_chain! {
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if let hir::ExprKind::Call(ref fun, ref args) = new.node;
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if args.len() == 1;
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if let hir::ExprKind::Path(ref path) = fun.node;
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if let Res::Def(DefKind::Method, did) = cx.tables.qpath_res(path, fun.hir_id);
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if match_def_path(cx, did, &paths::CSTRING_NEW);
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let source_type = cx.tables.expr_ty(source);
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if let ty::Adt(def, substs) = source_type.sty;
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if match_def_path(cx, def.did, &paths::RESULT);
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if match_type(cx, substs.type_at(0), &paths::CSTRING);
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then {
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span_lint_and_then(
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cx,
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@ -17,7 +17,7 @@ pub const CLONE_TRAIT_METHOD: [&str; 4] = ["core", "clone", "Clone", "clone"];
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pub const CMP_MAX: [&str; 3] = ["core", "cmp", "max"];
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pub const CMP_MIN: [&str; 3] = ["core", "cmp", "min"];
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pub const COW: [&str; 3] = ["alloc", "borrow", "Cow"];
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pub const CSTRING_NEW: [&str; 5] = ["std", "ffi", "c_str", "CString", "new"];
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pub const CSTRING: [&str; 4] = ["std", "ffi", "c_str", "CString"];
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pub const DEFAULT_TRAIT: [&str; 3] = ["core", "default", "Default"];
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pub const DEFAULT_TRAIT_METHOD: [&str; 4] = ["core", "default", "Default", "default"];
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pub const DEREF_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "Deref", "deref"];
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@ -1,9 +1,24 @@
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#![deny(clippy::temporary_cstring_as_ptr)]
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fn main() {}
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#[allow(clippy::result_unwrap_used)]
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fn temporary_cstring() {
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use std::ffi::CString;
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CString::new("foo").unwrap().as_ptr();
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CString::new("foo").expect("dummy").as_ptr();
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}
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mod issue4375 {
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use std::ffi::CString;
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use std::os::raw::c_char;
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extern "C" {
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fn foo(data: *const c_char);
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}
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pub fn bar(v: &[u8]) {
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let cstr = CString::new(v);
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unsafe { foo(cstr.unwrap().as_ptr()) }
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}
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}
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@ -1,29 +1,46 @@
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error: you are getting the inner pointer of a temporary `CString`
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--> $DIR/cstring.rs:7:5
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--> $DIR/cstring.rs:8:5
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LL | CString::new("foo").unwrap().as_ptr();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: `#[deny(clippy::temporary_cstring_as_ptr)]` on by default
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note: lint level defined here
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--> $DIR/cstring.rs:1:9
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LL | #![deny(clippy::temporary_cstring_as_ptr)]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: that pointer will be invalid outside this expression
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help: assign the `CString` to a variable to extend its lifetime
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--> $DIR/cstring.rs:7:5
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--> $DIR/cstring.rs:8:5
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LL | CString::new("foo").unwrap().as_ptr();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: you are getting the inner pointer of a temporary `CString`
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--> $DIR/cstring.rs:8:5
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--> $DIR/cstring.rs:9:5
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LL | CString::new("foo").expect("dummy").as_ptr();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: that pointer will be invalid outside this expression
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help: assign the `CString` to a variable to extend its lifetime
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--> $DIR/cstring.rs:8:5
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--> $DIR/cstring.rs:9:5
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LL | CString::new("foo").expect("dummy").as_ptr();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to 2 previous errors
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error: you are getting the inner pointer of a temporary `CString`
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--> $DIR/cstring.rs:22:22
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LL | unsafe { foo(cstr.unwrap().as_ptr()) }
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| ^^^^^^^^^^^^^^^^^^^^^^
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= note: that pointer will be invalid outside this expression
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help: assign the `CString` to a variable to extend its lifetime
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--> $DIR/cstring.rs:22:22
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LL | unsafe { foo(cstr.unwrap().as_ptr()) }
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| ^^^^^^^^^^^^^
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error: aborting due to 3 previous errors
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