File 0008-mount.cifs.c-fix-memory-leaks-in-main-func... of Package cifs-utils

Overview Repositories Revisions Requests Users Attributes Meta

File 0008-mount.cifs.c-fix-memory-leaks-in-main-func.patch of Package cifs-utils (Revision 3d5ace621153941897ff9d21d24f83ca)

Currently displaying revision 3d5ace621153941897ff9d21d24f83ca , Show latest

From bf7f48f4c7dcee623bd92b2e7a6ffd97a64a1138 Mon Sep 17 00:00:00 2001
From: Jiawen Liu <liujiawen10@huawei.com>
Date: Tue, 6 Aug 2019 10:35:29 +0800
Subject: [PATCH] mount.cifs.c: fix memory leaks in main func
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

In mount.cifs module, orgoptions and mountpoint in the main func
point to the memory allocated by func realpath and strndup respectively.
However, they are not freed before the main func returns so that the
memory leaks occurred.

The memory leak problem is reported by LeakSanitizer tool.
LeakSanitizer url: "https://github.com/google/sanitizers"

Here I free the pointers orgoptions and mountpoint before main
func returns.

Fixes：7549ad5e7126 ("memory leaks: caused by func realpath and strndup")
Signed-off-by: Jiawen Liu <liujiawen10@huawei.com>
Reported-by: Jin Du <dujin1@huawei.com>
Reviewed-by: Saisai Zhang <zhangsaisai@huawei.com>
Reviewed-by: Aurélien Aptel <aaptel@suse.com>
---
 mount.cifs.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/mount.cifs.c b/mount.cifs.c
index b3235e4..7748d54 100644
--- a/mount.cifs.c
+++ b/mount.cifs.c
@@ -1942,6 +1942,9 @@ restore_privs:
 		gid_t __attribute__((unused)) gignore = setfsgid(oldfsgid);
 	}
 
+	if (rc) {
+		free(*mountpointp);
+	}
 	return rc;
 }
 
@@ -2044,8 +2047,10 @@ int main(int argc, char **argv)
 
 	/* chdir into mountpoint as soon as possible */
 	rc = acquire_mountpoint(&mountpoint);
-	if (rc)
+	if (rc) {
+		free(orgoptions);
 		return rc;
+	}
 
 	/*
 	 * mount.cifs does privilege separation. Most of the code to handle
@@ -2064,6 +2069,8 @@ int main(int argc, char **argv)
 		/* child */
 		rc = assemble_mountinfo(parsed_info, thisprogram, mountpoint,
 					orig_dev, orgoptions);
+		free(orgoptions);
+		free(mountpoint);
 		return rc;
 	} else {
 		/* parent */
@@ -2209,5 +2216,6 @@ mount_exit:
 	}
 	free(options);
 	free(orgoptions);
+	free(mountpoint);
 	return rc;
 }
-- 
2.16.4

Places

File 0008-mount.cifs.c-fix-memory-leaks-in-main-func.patch of Package cifs-utils (Revision 3d5ace621153941897ff9d21d24f83ca)

Places