From 15f13f74b67a8d46d8429d7f53128a167c84eebd Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Thu, 28 Apr 2022 19:39:28 +0200
Subject: check mul/add when indexing into phdr

---
 src/lib.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/lib.rs b/src/lib.rs
index d3f5b4e..a5d3a7c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -242,7 +242,8 @@ impl Elf<'_> {
         let phoff = usize::try_from(phoff).expect("phoff too large!");
 
         for ph in 0..phnum {
-            let pos = phoff + usize::from(ph * phentsize);
+            let off = ph.checked_mul(phentsize).map(usize::from).expect("phdr offset overflowed");
+            let pos = phoff.checked_add(off).expect("phdr position overflowed");
             r.set_pos(pos);
 
             // We only care about load segments.
-- 
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