Avoid overflow when header.n_namesz is 0

m4b · Jan 29, 2021 · 9163d15 · 9163d15
1 parent 8d91dd7
commit 9163d15
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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);