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signal/cifs: Fix cifs_put_tcp_session to call send_sig instead of force_sig

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The locking in force_sig_info is not prepared to deal with a task that
exits or execs (as sighand may change).  The is not a locking problem
in force_sig as force_sig is only built to handle synchronous
exceptions.

Further the function force_sig_info changes the signal state if the
signal is ignored, or blocked or if SIGNAL_UNKILLABLE will prevent the
delivery of the signal.  The signal SIGKILL can not be ignored and can
not be blocked and SIGNAL_UNKILLABLE won't prevent it from being
delivered.

So using force_sig rather than send_sig for SIGKILL is confusing
and pointless.

Because it won't impact the sending of the signal and and because
using force_sig is wrong, replace force_sig with send_sig.

Cc: Namjae Jeon <namjae.jeon@samsung.com>
Cc: Jeff Layton <jlayton@primarydata.com>
Cc: Steve French <smfrench@gmail.com>
Fixes: a5c3e1c725 ("Revert "cifs: No need to send SIGKILL to demux_thread during umount"")
Fixes: e7ddee9037 ("cifs: disable sharing session and tcon and add new TCP sharing code")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2019-05-15 12:33:50 -05:00
parent f9070dc945
commit 72abe3bcf0
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/connect.c
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@ -2629,7 +2629,7 @@ cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
task = xchg(&server->tsk, NULL);
if (task)
force_sig(SIGKILL, task);
send_sig(SIGKILL, task, 1);
}
static struct TCP_Server_Info *