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Message-Id: <20191123160444.11251-3-yamada.masahiro@socionext.com>
Date: Sun, 24 Nov 2019 01:04:30 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: linux-kbuild@...r.kernel.org
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 02/16] scripts/kallsyms: fix definitely-lost memory leak
build_initial_tok_table() overwrites unused sym_entry to shrink the
table size. Before the entry is overwritten, table[i].sym must be freed
since it is malloc'ed data.
This fixes the 'definitely lost' report from valgrind. I ran valgrind
against x86_64_defconfig of v5.4-rc8 kernel, and here is the summary:
[Before the fix]
LEAK SUMMARY:
definitely lost: 53,184 bytes in 2,874 blocks
[After the fix]
LEAK SUMMARY:
definitely lost: 0 bytes in 0 blocks
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---
Changes in v2: None
scripts/kallsyms.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 918c2ba071b5..79641874d860 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -487,6 +487,8 @@ static void build_initial_tok_table(void)
table[pos] = table[i];
learn_symbol(table[pos].sym, table[pos].len);
pos++;
+ } else {
+ free(table[i].sym);
}
}
table_cnt = pos;
--
2.17.1
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