[PATCH 12/13] kexec: x86_64: elf: fix memory leak caused by get_command_line

[Zhang Yanfei]

From: Zhang Yanfei <zhangyanfei at cn.fujitsu.com>

Since get_command_line returns dynamically allocated memory, it is
easy for the caller to forget freeing the memory. Here fixes a
memory leak caused by this function.

Signed-off-by: Zhang Yanfei <zhangyanfei at cn.fujitsu.com>
---
 kexec/arch/x86_64/kexec-elf-x86_64.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/kexec/arch/x86_64/kexec-elf-x86_64.c b/kexec/arch/x86_64/kexec-elf-x86_64.c
index a3fc728..4a41780 100644
--- a/kexec/arch/x86_64/kexec-elf-x86_64.c
+++ b/kexec/arch/x86_64/kexec-elf-x86_64.c
@@ -89,6 +89,7 @@ int elf_x86_64_load(int argc, char **argv, const char *buf, off_t len,
 	struct mem_ehdr ehdr;
 	const char *append = NULL;
 	char *command_line = NULL, *modified_cmdline;
+	char *tmp_cmdline = NULL;
 	int command_line_len;
 	const char *ramdisk;
 	unsigned long entry, max_addr;
@@ -135,7 +136,7 @@ int elf_x86_64_load(int argc, char **argv, const char *buf, off_t len,
 			append = optarg;
 			break;
 		case OPT_REUSE_CMDLINE:
-			command_line = get_command_line();
+			tmp_cmdline = get_command_line();
 			break;
 		case OPT_RAMDISK:
 			ramdisk = optarg;
@@ -155,7 +156,9 @@ int elf_x86_64_load(int argc, char **argv, const char *buf, off_t len,
 			break;
 		}
 	}
-	command_line = concat_cmdline(command_line, append);
+	command_line = concat_cmdline(tmp_cmdline, append);
+	if (tmp_cmdline)
+		free(tmp_cmdline);
 	command_line_len = 0;
 	if (command_line) {
 		command_line_len = strlen(command_line) +1;
-- 
1.7.1