linux-ext4 - [PATCH 04/12] ss_add_info_dir: fix memory leak and check whether,NULL pointer

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Date:   Mon, 24 May 2021 19:21:15 +0800
From:   Wu Guanghao <wuguanghao3@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <liuzhiqiang26@...wei.com>, <linfeilong@...wei.com>
Subject: [PATCH 04/12] ss_add_info_dir: fix memory leak and check whether,NULL
 pointer

In ss_add_info_dir(), need free info->info_dirs before return,
otherwise it will cause memory leak. At the same time, it is necessary
to check whether dirs[n_dirs] is a null pointer, otherwise a segmentation
fault will occur.

Signed-off-by: Wu Guanghao <wuguanghao3@...wei.com>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Reviewed-by: Wu Bo <wubo40@...wei.com>
---
 lib/ss/help.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/ss/help.c b/lib/ss/help.c
index 5204401b..429f410e 100644
--- a/lib/ss/help.c
+++ b/lib/ss/help.c
@@ -148,6 +148,7 @@ void ss_add_info_dir(int sci_idx, char *info_dir, int *code_ptr)
     dirs = (char **)realloc((char *)dirs,
 			    (unsigned)(n_dirs + 2)*sizeof(char *));
     if (dirs == (char **)NULL) {
+	free(info->info_dirs);
 	info->info_dirs = (char **)NULL;
 	*code_ptr = errno;
 	return;
@@ -155,6 +156,10 @@ void ss_add_info_dir(int sci_idx, char *info_dir, int *code_ptr)
     info->info_dirs = dirs;
     dirs[n_dirs + 1] = (char *)NULL;
     dirs[n_dirs] = malloc((unsigned)strlen(info_dir)+1);
+    if (dirs[n_dirs] = (char *)NULL) {
+        *code_ptr = errno;
+        return;
+    }
     strcpy(dirs[n_dirs], info_dir);
     *code_ptr = 0;
 }
--