Commit 9abb8f60 authored Nov 24, 2019 by Masahiro Yamada Committed by Greg Kroah-Hartman Jan 04, 2020

scripts/kallsyms: fix definitely-lost memory leak



[ Upstream commit 21915eca088dc271c970e8351290e83d938114ac ]

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@socionext.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent dac861db

scripts/kallsyms.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -498,6 +498,8 @@ 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;