From 9163d1531572f1fd4d73e2ff788a7880a4b3c4dd Mon Sep 17 00:00:00 2001
From: Mike Hommey <mh@glandium.org>
Date: Fri, 29 Jan 2021 18:02:14 +0900
Subject: [PATCH] Avoid overflow when header.n_namesz is 0

---
 src/elf/note.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/elf/note.rs b/src/elf/note.rs
index 04977121..c6eb784f 100644
--- a/src/elf/note.rs
+++ b/src/elf/note.rs
@@ -205,7 +205,7 @@ if_alloc! {
             };
             debug!("{:?} - {:#x}", header, *offset);
             // -1 because includes \0 terminator
-            let name = bytes.gread_with::<&'a str>(offset, ctx::StrCtx::Length(header.n_namesz - 1))?;
+            let name = bytes.gread_with::<&'a str>(offset, ctx::StrCtx::Length(header.n_namesz.saturating_sub(1)))?;
             *offset += 1;
             align(alignment, offset);
             debug!("note name {} - {:#x}", name, *offset);