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smb: client: fix potential UAF in cifs_stats_proc_write()

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commit d3da25c5ac84430f89875ca7485a3828150a7e0a upstream.

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

Cc: stable@vger.kernel.org
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paulo Alcantara 2024-04-02 16:33:55 -03:00 committed by Greg Kroah-Hartman
parent 2290423146
commit 8fefd166fc
1 changed files with 2 additions and 0 deletions
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2
fs/smb/client/cifs_debug.c
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@ -568,6 +568,8 @@ static ssize_t cifs_stats_proc_write(struct file *file,
} }
#endif /* CONFIG_CIFS_STATS2 */ #endif /* CONFIG_CIFS_STATS2 */
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
if (cifs_ses_exiting(ses))
continue;
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
atomic_set(&tcon->num_smbs_sent, 0); atomic_set(&tcon->num_smbs_sent, 0);
spin_lock(&tcon->stat_lock); spin_lock(&tcon->stat_lock);