Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 6.4 4/4] cifs: fix session state check in reconnect to avoid use-after-free issue | Date | Sun, 23 Jul 2023 21:31:11 -0400 |
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From: Winston Wen <wentao@uniontech.com>
[ Upstream commit 99f280700b4cc02d5f141b8d15f8e9fad0418f65 ]
Don't collect exiting session in smb2_reconnect_server(), because it will be released soon.
Note that the exiting session will stay in server->smb_ses_list until it complete the cifs_free_ipc() and logoff() and then delete itself from the list.
Signed-off-by: Winston Wen <wentao@uniontech.com> Reviewed-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/smb/client/smb2pdu.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index 17fe212ab895d..e04766fe6f803 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -3797,6 +3797,12 @@ void smb2_reconnect_server(struct work_struct *work) spin_lock(&cifs_tcp_ses_lock); list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { + spin_lock(&ses->ses_lock); + if (ses->ses_status == SES_EXITING) { + spin_unlock(&ses->ses_lock); + continue; + } + spin_unlock(&ses->ses_lock); tcon_selected = false; -- 2.39.2
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