smb: client: Reset all search buffer pointers when releasing buffer

commit e48f9d8 upstream.

Multiple pointers in struct cifs_search_info (ntwrk_buf_start,
srch_entries_start, and last_entry) point to the same allocated buffer.
However, when freeing this buffer, only ntwrk_buf_start was set to NULL,
while the other pointers remained pointing to freed memory.

This is defensive programming to prevent potential issues with stale
pointers. While the active UAF vulnerability is fixed by the previous
patch, this change ensures consistent pointer state and more robust error
handling.

Signed-off-by: Wang Zhaolong <wangzhaolong1@huawei.com>
Cc: stable@vger.kernel.org
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Wang Zhaolong <wangzhaolong1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 9f5748b6948174ec51d2a8a35598b224e74566d7)
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>

Author: Wang Zhaolong

fs/cifs/readdir.c

@@ -621,7 +621,10 @@ find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
 			else
 				cifs_buf_release(cfile->srch_inf.
 						ntwrk_buf_start);
+			/* Reset all pointers to the network buffer to prevent stale references */
 			cfile->srch_inf.ntwrk_buf_start = NULL;
+			cfile->srch_inf.srch_entries_start = NULL;
+			cfile->srch_inf.last_entry = NULL;
 		}
 		rc = initiate_cifs_search(xid, file);
 		if (rc) {