From 1e2d37bf4a083fe5224bab6da3510846f5171864 Mon Sep 17 00:00:00 2001
From: Kornel <kornel@geekhood.net>
Date: Mon, 9 Oct 2023 14:32:15 +0100
Subject: [PATCH] Handle out of memory errors in fs::read/read_to_string

---
 library/std/src/fs.rs     | 6 ++++--
 library/std/src/io/mod.rs | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/library/std/src/fs.rs b/library/std/src/fs.rs
index 63bf6b0c1ab01..60df6f2ef3447 100644
--- a/library/std/src/fs.rs
+++ b/library/std/src/fs.rs
@@ -254,7 +254,8 @@ 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 mut bytes = Vec::with_capacity(size.unwrap_or(0));
+        let mut bytes = Vec::new();
+        bytes.try_reserve(size.unwrap_or(0)).map_err(|_| io::ErrorKind::OutOfMemory)?;
         io::default_read_to_end(&mut file, &mut bytes, size)?;
         Ok(bytes)
     }
@@ -296,7 +297,8 @@ 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 mut string = String::with_capacity(size.unwrap_or(0));
+        let mut string = String::new();
+        string.try_reserve(size.unwrap_or(0)).map_err(|_| io::ErrorKind::OutOfMemory)?;
         io::default_read_to_string(&mut file, &mut string, size)?;
         Ok(string)
     }
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index 94f2283d5d4f5..c6a610cb04b12 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -430,7 +430,7 @@ pub(crate) fn default_read_to_end<R: Read + ?Sized>(
         loop {
             match r.read(&mut probe) {
                 Ok(n) => {
-                    buf.try_reserve(n).map_err(|_| io::ErrorKind::OutOfMemory)?;
+                    buf.try_reserve(n).map_err(|_| ErrorKind::OutOfMemory)?;
                     buf.extend_from_slice(&probe[..n]);
                     return Ok(n);
                 }