linux-kernel - Re: [syzbot] [cifs?] memory leak in smb3_fs_context_parse

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Message-ID: <tencent_884C1769576F66DEB36003674976C3A32405@qq.com>
Date: Fri,  7 Nov 2025 20:48:52 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+72afd4c236e6bc3f4bac@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [cifs?] memory leak in smb3_fs_context_parse_param

#syz test

diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c
index e60927b2a7c8..0e1949bcd6ea 100644
--- a/fs/smb/client/fs_context.c
+++ b/fs/smb/client/fs_context.c
@@ -1435,12 +1435,16 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 			cifs_errorf(fc, "Unknown error parsing devname\n");
 			goto cifs_parse_mount_err;
 		}
+		kfree_sensitive(ctx->source);
+		ctx->source = NULL;
 		ctx->source = smb3_fs_context_fullpath(ctx, '/');
 		if (IS_ERR(ctx->source)) {
 			ctx->source = NULL;
 			cifs_errorf(fc, "OOM when copying UNC string\n");
 			goto cifs_parse_mount_err;
 		}
+		kfree_sensitive(fc->source);
+		fc->source = NULL;
 		fc->source = kstrdup(ctx->source, GFP_KERNEL);
 		if (fc->source == NULL) {
 			cifs_errorf(fc, "OOM when copying UNC string\n");
-- 
2.43.0