commit a3208108b0b2b98004dac023aaeb794c1ec9149a
author Ricardo Fernández Serrata <76864299+Rudxain@users.noreply.github.com> Fri Jul 04 19:10:39 2025 -0400
committer Ricardo Fernández Serrata <76864299+Rudxain@users.noreply.github.com> Sat Jul 05 22:10:10 2025 +0000
tree 78bb5e42e41412f03a0bfb1496800269e3542c3a
parent 175e04331be56c5b4bdf77478434b1a5e0556770

fix(lib-std-fs): handle `usize` overflow in `read` & `read_to_string`

library/std/src/fs.rs

diff --git a/library/std/src/fs.rs b/library/std/src/fs.rs
index 72ad7c24..9fbfd92 100644
--- a/library/std/src/fs.rs
+++ b/library/std/src/fs.rs
@@ -304,7 +304,7 @@ pub struct DirBuilder {
 pub fn read<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
     fn inner(path: &Path) -> io::Result<Vec<u8>> {
         let mut file = File::open(path)?;
-        let size = file.metadata().map(|m| m.len() as usize).ok();
+        let size = file.metadata().map(|m| usize::try_from(m.len()).unwrap_or(usize::MAX)).ok();
         let mut bytes = Vec::try_with_capacity(size.unwrap_or(0))?;
         io::default_read_to_end(&mut file, &mut bytes, size)?;
         Ok(bytes)
@@ -346,7 +346,7 @@ fn inner(path: &Path) -> io::Result<Vec<u8>> {
 pub fn read_to_string<P: AsRef<Path>>(path: P) -> io::Result<String> {
     fn inner(path: &Path) -> io::Result<String> {
         let mut file = File::open(path)?;
-        let size = file.metadata().map(|m| m.len() as usize).ok();
+        let size = file.metadata().map(|m| usize::try_from(m.len()).unwrap_or(usize::MAX)).ok();
         let mut string = String::new();
         string.try_reserve_exact(size.unwrap_or(0))?;
         io::default_read_to_string(&mut file, &mut string, size)?;