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cifs: Fix memory and information leak in smb3_reconfigure()

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[ Upstream commit cb6d5aa9c0 ]

In smb3_reconfigure(), if smb3_sync_session_ctx_passwords() fails, the
function returns immediately without freeing and erasing the newly
allocated new_password and new_password2. This causes both a memory leak
and a potential information leak.

Fix this by calling kfree_sensitive() on both password buffers before
returning in this error case.

Fixes: 0f0e357902 ("cifs: during remount, make sure passwords are in sync")
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Reviewed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zilin Guan
2026-01-02 12:57:04 +01:00
committed by Greg Kroah-Hartman
parent f8b19571b1
commit bb82aaee16
1 changed files with 2 additions and 0 deletions
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fs/smb/client/fs_context.c
+2
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@@ -1080,6 +1080,8 @@ static int smb3_reconfigure(struct fs_context *fc)
rc = smb3_sync_session_ctx_passwords(cifs_sb, ses);
if (rc) {
mutex_unlock(&ses->session_mutex);
kfree_sensitive(new_password);
kfree_sensitive(new_password2);
return rc;
}