linux-kernel - [tip:core/urgent] objtool: Fix double-free in .cold detection error path

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Date:   Tue, 20 Nov 2018 10:05:11 -0800
From:   tip-bot for Artem Savkov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        torvalds@...ux-foundation.org, mingo@...nel.org,
        tglx@...utronix.de, hpa@...or.com, jpoimboe@...hat.com,
        asavkov@...hat.com
Subject: [tip:core/urgent] objtool: Fix double-free in .cold detection error
 path

Commit-ID:  0b9301fb632f7111a3293a30cc5b20f1b82ed08d
Gitweb:     https://git.kernel.org/tip/0b9301fb632f7111a3293a30cc5b20f1b82ed08d
Author:     Artem Savkov <asavkov@...hat.com>
AuthorDate: Tue, 20 Nov 2018 11:52:15 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 20 Nov 2018 18:59:00 +0100

objtool: Fix double-free in .cold detection error path

If read_symbols() fails during second list traversal (the one dealing
with ".cold" subfunctions) it frees the symbol, but never deletes it
from the list/hash_table resulting in symbol being freed again in
elf_close(). Fix it by just returning an error, leaving cleanup to
elf_close().

Signed-off-by: Artem Savkov <asavkov@...hat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: 13810435b9a7 ("objtool: Support GCC 8's cold subfunctions")
Link: http://lkml.kernel.org/r/beac5a9b7da9e8be90223459dcbe07766ae437dd.1542736240.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...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 6dbb9fae0f9d..e7a7ac40e045 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -312,7 +312,7 @@ static int read_symbols(struct elf *elf)
 			if (!pfunc) {
 				WARN("%s(): can't find parent function",
 				     sym->name);
-				goto err;
+				return -1;
 			}
 
 			sym->pfunc = pfunc;