linux-kernel - [tip: objtool/urgent] objtool: Fix off-by-one in symbol_by

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Message-ID: <158759429500.28353.17940657734487832163.tip-bot2@tip-bot2>
Date:   Wed, 22 Apr 2020 22:24:55 -0000
From:   "tip-bot2 for Julien Thierry" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Julien Thierry <jthierry@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: objtool/urgent] objtool: Fix off-by-one in symbol_by_offset()

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     7f9b34f36cf6b2099f19e679a9e8315c955ef2ee
Gitweb:        https://git.kernel.org/tip/7f9b34f36cf6b2099f19e679a9e8315c955ef2ee
Author:        Julien Thierry <jthierry@...hat.com>
AuthorDate:    Fri, 03 Apr 2020 14:17:30 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 22 Apr 2020 23:14:46 +02:00

objtool: Fix off-by-one in symbol_by_offset()

Sometimes, WARN_FUNC() and other users of symbol_by_offset() will
associate the first instruction of a symbol with the symbol preceding
it.  This is because symbol->offset + symbol->len is already outside of
the symbol's range.

Fixes: 2a362ecc3ec9 ("objtool: Optimize find_symbol_*() and read_symbols()")
Signed-off-by: Julien Thierry <jthierry@...hat.com>
Reviewed-by: Miroslav Benes <mbenes@...e.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 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 09ddc8f..c4857fa 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -105,7 +105,7 @@ static int symbol_by_offset(const void *key, const struct rb_node *node)
 
 	if (*o < s->offset)
 		return -1;
-	if (*o > s->offset + s->len)
+	if (*o >= s->offset + s->len)
 		return 1;
 
 	return 0;