gfs2: Fix use-after-free in gfs2_logd after withdraw

When the gfs2_logd daemon withdrew, the withdraw sequence called
into make_fs_ro() to make the file system read-only. That caused the
journal descriptors to be freed. However, those journal descriptors
were used by gfs2_logd's call to gfs2_ail_flush_reqd(). This caused
a use-after free and NULL pointer dereference.

This patch changes function gfs2_logd() so that it stops all logd
work until the thread is told to stop. Once a withdraw is done,
it only does an interruptible sleep.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 3a75843..cf0b80c 100644 (file)
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -1131,6 +1131,10 @@ int gfs2_logd(void *data)
 
        while (!kthread_should_stop()) {
 
+               if (gfs2_withdrawn(sdp)) {
+                       msleep_interruptible(HZ);
+                       continue;
+               }
                /* Check for errors writing to the journal */
                if (sdp->sd_log_error) {
                        gfs2_lm(sdp,
@@ -1139,6 +1143,7 @@ int gfs2_logd(void *data)
                                "prevent further damage.\n",
                                sdp->sd_fsname, sdp->sd_log_error);
                        gfs2_withdraw(sdp);
+                       continue;
                }
 
                did_flush = false;