[PATCH 02/13] kexec: i386: bzImage: fix memory leak caused by get_command_line

[Zhang Yanfei <zhangyanfei.yes@gmail.com>]

From: Zhang Yanfei <zhangyanfei@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@cn.fujitsu.com>
---
 kexec/arch/i386/kexec-bzImage.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kexec/arch/i386/kexec-bzImage.c b/kexec/arch/i386/kexec-bzImage.c
index 99fd790..39452a4 100644
--- a/kexec/arch/i386/kexec-bzImage.c
+++ b/kexec/arch/i386/kexec-bzImage.c
@@ -382,6 +382,7 @@ int bzImage_load(int argc, char **argv, const char *buf, off_t len,
 	struct kexec_info *info)
 {
 	char *command_line = NULL;
+	char *tmp_cmdline = NULL;
 	const char *ramdisk, *append = NULL;
 	char *ramdisk_buf;
 	off_t ramdisk_length;
@@ -421,7 +422,7 @@ int bzImage_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;
@@ -431,7 +432,10 @@ int bzImage_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

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