From: Paulo Alcantara pc@manguebit.com

commit d3da25c5ac84430f89875ca7485a3828150a7e0a upstream.

Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.

Cc: stable@vger.kernel.org # 5.4 Signed-off-by: Paulo Alcantara (Red Hat) pc@manguebit.com Signed-off-by: Steve French stfrench@microsoft.com [ chanho: Backported to v5.4.y, cifs_debug.c was moved from fs/cifs to fs/smb/client ] Signed-off-by: Chanho Min chanho.min@lge.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/cifs/cifs_debug.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c index df3dfa611c352..47190e676aa25 100644 --- a/fs/cifs/cifs_debug.c +++ b/fs/cifs/cifs_debug.c @@ -470,6 +470,8 @@ static ssize_t cifs_stats_proc_write(struct file *file, } #endif /* CONFIG_CIFS_STATS2 */ list_for_each(tmp2, &server->smb_ses_list) { + if (cifs_ses_exiting(ses)) + continue; ses = list_entry(tmp2, struct cifs_ses, smb_ses_list); list_for_each(tmp3, &ses->tcon_list) {