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Avoid subtract with overflow when growing the stack on musl libc #51

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Avoid subtract with overflow when growing the stack on musl libc #51

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a9a3cf6
fix underflow crash
jcnelson Mar 5, 2021
8e4509c
oops; typo
jcnelson Mar 5, 2021
59775ef
Merge branch 'rust-lang:master' into master
jcnelson Jul 6, 2022
22e5ea1
Merge branch 'master' of https://github.com/rust-lang/stacker
jcnelson Dec 6, 2022
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12 changes: 11 additions & 1 deletion src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,17 @@ pub fn grow<R, F: FnOnce() -> R>(stack_size: usize, callback: F) -> R {
/// to determine whether a stack switch should be made or not.
pub fn remaining_stack() -> Option<usize> {
let current_ptr = current_stack_ptr();
get_stack_limit().map(|limit| current_ptr - limit)
match get_stack_limit() {
Some(limit) => {
if current_ptr < limit {
None
}
else {
Some(current_ptr - limit)
}
},
None => None
}
}

psm_stack_information!(
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