linux-kernel - [RFC 25/31] objtool: Fix interval tree insertion for zero-length symbols

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Message-ID: <5b44cec6fa1b80b7059e557e5b37a3a673e27e90.1725334260.git.jpoimboe@kernel.org>
Date: Mon,  2 Sep 2024 21:00:08 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: live-patching@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	x86@...nel.org,
	Miroslav Benes <mbenes@...e.cz>,
	Petr Mladek <pmladek@...e.com>,
	Joe Lawrence <joe.lawrence@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Marcos Paulo de Souza <mpdesouza@...e.com>,
	Song Liu <song@...nel.org>
Subject: [RFC 25/31] objtool: Fix interval tree insertion for zero-length symbols

Zero-length symbols get inserted in the wrong spot.  Fix that.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 tools/objtool/elf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 49528e7835aa..42a657268306 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -94,7 +94,7 @@ static inline unsigned long __sym_start(struct symbol *s)
 
 static inline unsigned long __sym_last(struct symbol *s)
 {
-	return s->offset + s->len - 1;
+	return s->offset + (s->len ? s->len - 1 : 0);
 }
 
 INTERVAL_TREE_DEFINE(struct symbol, node, unsigned long, __subtree_last,
-- 
2.45.2