distribute: check for 'conf' before dereferencing it

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Vijay Bellur <vijay@dev.gluster.com>

BUG: 1806 ()
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1806

4 files changed, 85 insertions, 15 deletions

diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
index 2beb0ec2d..d537c1178 100644
--- a/xlators/cluster/dht/src/dht-common.c
+++ b/xlators/cluster/dht/src/dht-common.c
@@ -294,6 +294,8 @@ dht_do_fresh_lookup_on_root (xlator_t *this, call_frame_t *frame)
 
         local = frame->local;
         conf = this->private;
+        if (!conf)
+                goto err;
 
         if (local->layout) {
                 dht_layout_unref (this, local->layout);
@@ -351,6 +353,8 @@ dht_revalidate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         local = frame->local;
         prev  = cookie;
 	conf = this->private;
+        if (!conf)
+                goto out;
 
         LOCK (&frame->lock);
         {
@@ -431,14 +435,14 @@ dht_revalidate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 	}
 unlock:
 	UNLOCK (&frame->lock);
-
+out:
         this_call_cnt = dht_frame_return (frame);
 
         if (is_last_call (this_call_cnt)) {
 		if (!IA_ISDIR (local->stbuf.ia_type)
 		    && (local->hashed_subvol != local->cached_subvol)
 		    && (local->stbuf.ia_nlink == 1)
-		    && (conf->unhashed_sticky_bit)) {
+                    && (conf && conf->unhashed_sticky_bit)) {
 			local->stbuf.ia_prot.sticky = 1;
 		}
 
@@ -496,7 +500,7 @@ dht_lookup_linkfile_create_cbk (call_frame_t *frame, void *cookie,
 
 	local->op_ret = 0;
 	if ((local->stbuf.ia_nlink == 1)
-	    && (conf->unhashed_sticky_bit)) {
+	    && (conf && conf->unhashed_sticky_bit)) {
 		local->stbuf.ia_prot.sticky = 1;
 	}
 
@@ -686,6 +690,8 @@ dht_lookup_everywhere (call_frame_t *frame, xlator_t *this, loc_t *loc)
 
 	conf = this->private;
 	local = frame->local;
+        if (!conf)
+                goto out;
 
 	call_cnt = conf->subvolume_cnt;
 	local->call_cnt = call_cnt;
@@ -700,7 +706,10 @@ dht_lookup_everywhere (call_frame_t *frame, xlator_t *this, loc_t *loc)
 			    loc, local->xattr_req);
 	}
 
-	return 0;
+        return 0;
+out:
+        DHT_STACK_UNWIND (lookup, frame, -1, EINVAL, NULL, NULL, NULL, NULL);
+        return 0;
 }
 
 
@@ -745,7 +754,7 @@ dht_lookup_linkfile_cbk (call_frame_t *frame, void *cookie,
         }
 
 	if ((stbuf->ia_nlink == 1)
-	    && (conf->unhashed_sticky_bit)) {
+	    && (conf && conf->unhashed_sticky_bit)) {
 		stbuf->ia_prot.sticky = 1;
 	}
         dht_itransform (this, prev->this, stbuf->ia_ino, &stbuf->ia_ino);
@@ -788,17 +797,19 @@ dht_lookup_directory (call_frame_t *frame, xlator_t *this, loc_t *loc)
         conf = this->private;
         local = frame->local;
 
+        if (!conf)
+                goto unwind;
+
         call_cnt        = conf->subvolume_cnt;
         local->call_cnt = call_cnt;
-		
+
         local->layout = dht_layout_new (this, conf->subvolume_cnt);
         if (!local->layout) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "Out of memory");
-                DHT_STACK_UNWIND (lookup, frame, -1, ENOMEM, NULL, NULL, NULL, NULL);
-                return 0;
+                goto unwind;
         }
-		
+
         for (i = 0; i < call_cnt; i++) {
                 STACK_WIND (frame, dht_lookup_dir_cbk,
                             conf->subvolumes[i],
@@ -806,6 +817,10 @@ dht_lookup_directory (call_frame_t *frame, xlator_t *this, loc_t *loc)
                             &local->loc, local->xattr_req);
         }
         return 0;
+unwind:
+        DHT_STACK_UNWIND (lookup, frame, -1, ENOMEM, NULL, NULL, NULL, NULL);
+        return 0;
+
 }
 
 
@@ -827,6 +842,8 @@ dht_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         dht_layout_t *parent_layout = NULL;
 
         conf  = this->private;
+        if (!conf)
+                goto out;
 
         prev  = cookie;
         local = frame->local;
@@ -952,6 +969,8 @@ dht_lookup (call_frame_t *frame, xlator_t *this,
         VALIDATE_OR_GOTO (loc->path, err);
 
 	conf = this->private;
+        if (!conf)
+                goto err;
 
         local = dht_local_init (frame);
 	if (!local) {
@@ -1818,6 +1837,7 @@ dht_getxattr (call_frame_t *frame, xlator_t *this,
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
         VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
         conf   = this->private;
         layout = dht_layout_get (this, loc->inode);
@@ -2466,6 +2486,7 @@ dht_statfs (call_frame_t *frame, xlator_t *this, loc_t *loc)
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
         VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
 	conf = this->private;
 
@@ -2501,6 +2522,7 @@ dht_opendir (call_frame_t *frame, xlator_t *this, loc_t *loc, fd_t *fd)
         VALIDATE_OR_GOTO (frame, err);
         VALIDATE_OR_GOTO (this, err);
         VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
 	conf = this->private;
 
@@ -2809,6 +2831,8 @@ dht_readdir (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
         int          i = 0;
 
         conf = this->private;
+        if (!conf)
+                goto out;
 
         for (i = 0; i < conf->subvolume_cnt; i++) {
                 if (!conf->subvolume_status[i]) {
@@ -2820,6 +2844,7 @@ dht_readdir (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
         if (conf->use_readdirp)
                 op = GF_FOP_READDIRP;
 
+out:
         dht_do_readdir (frame, this, fd, size, yoff, op);
         return 0;
 }
@@ -2874,6 +2899,7 @@ dht_fsyncdir (call_frame_t *frame, xlator_t *this, fd_t *fd, int datasync)
         VALIDATE_OR_GOTO (frame, err);
         VALIDATE_OR_GOTO (this, err);
         VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
 	conf = this->private;
 
@@ -3628,6 +3654,8 @@ dht_mkdir_hashed_cbk (call_frame_t *frame, void *cookie,
 	int           i = 0;
 	xlator_t     *hashed_subvol = NULL;
 
+        VALIDATE_OR_GOTO (this->private, err);
+
 	local = frame->local;
 	prev  = cookie;
 	layout = local->layout;
@@ -3693,6 +3721,7 @@ dht_mkdir (call_frame_t *frame, xlator_t *this,
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
         VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
 	conf = this->private;
 
@@ -3848,6 +3877,8 @@ dht_rmdir_do (call_frame_t *frame, xlator_t *this)
 	dht_conf_t   *conf = NULL;
 	int           i = 0;
 
+        VALIDATE_OR_GOTO (this->private, err);
+
 	conf = this->private;
 	local = frame->local;
 
@@ -4141,6 +4172,7 @@ dht_rmdir (call_frame_t *frame, xlator_t *this, loc_t *loc, int flags)
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
         VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
 	conf = this->private;
 
@@ -4683,6 +4715,8 @@ dht_init_subvolumes (xlator_t *this, dht_conf_t *conf)
         xlator_list_t *subvols = NULL;
         int            cnt = 0;
 
+        if (!conf)
+                return -1;
 
         for (subvols = this->children; subvols; subvols = subvols->next)
                 cnt++;
@@ -4727,6 +4761,8 @@ dht_notify (xlator_t *this, int event, void *data, ...)
         int         notify = 1;
 
 	conf = this->private;
+        if (!conf)
+                return ret;
 
 	switch (event) {
 	case GF_EVENT_CHILD_UP:
diff --git a/xlators/cluster/dht/src/dht-helper.c b/xlators/cluster/dht/src/dht-helper.c
index 3467bfe01..9e21713f7 100644
--- a/xlators/cluster/dht/src/dht-helper.c
+++ b/xlators/cluster/dht/src/dht-helper.c
@@ -64,6 +64,8 @@ dht_itransform (xlator_t *this, xlator_t *subvol, uint64_t x, uint64_t *y_p)
 	}
 
 	conf = this->private;
+        if (!conf)
+                goto out;
 
 	max = conf->subvolume_cnt;
 	cnt = dht_subvol_cnt (this, subvol);
@@ -147,6 +149,8 @@ dht_deitransform (xlator_t *this, uint64_t y, xlator_t **subvol_p,
 	uint64_t    x = 0;
 	xlator_t   *subvol = 0;
 
+        if (!this->private)
+                goto out;
 
 	conf = this->private;
 	max = conf->subvolume_cnt;
@@ -162,6 +166,7 @@ dht_deitransform (xlator_t *this, uint64_t y, xlator_t **subvol_p,
 	if (x_p)
 		*x_p = x;
 
+out:
 	return 0;
 }
 
@@ -262,6 +267,8 @@ dht_first_up_subvol (xlator_t *this)
 	int         i = 0;
 
 	conf = this->private;
+        if (!conf)
+                goto out;
 
 	LOCK (&conf->subvolume_lock);
 	{
@@ -274,6 +281,7 @@ dht_first_up_subvol (xlator_t *this)
 	}
 	UNLOCK (&conf->subvolume_lock);
 
+out:
 	return child;
 }
 
@@ -285,6 +293,9 @@ dht_last_up_subvol (xlator_t *this)
         int         i = 0;
 
         conf = this->private;
+        if (!conf)
+                goto out;
+
         LOCK (&conf->subvolume_lock);
         {
                 for (i = conf->subvolume_cnt-1; i >= 0; i--) {
@@ -296,6 +307,7 @@ dht_last_up_subvol (xlator_t *this)
         }
         UNLOCK (&conf->subvolume_lock);
 
+out:
         return child;
 }
 
@@ -369,6 +381,8 @@ dht_subvol_next (xlator_t *this, xlator_t *prev)
 	xlator_t   *next = NULL;
 
 	conf = this->private;
+        if (!conf)
+                goto out;
 
 	for (i = 0; i < conf->subvolume_cnt; i++) {
 		if (conf->subvolumes[i] == prev) {
@@ -378,6 +392,7 @@ dht_subvol_next (xlator_t *this, xlator_t *prev)
 		}
 	}
 
+out:
 	return next;
 }
 
@@ -389,8 +404,9 @@ dht_subvol_cnt (xlator_t *this, xlator_t *subvol)
 	int ret = -1;
 	dht_conf_t *conf = NULL;
 
-
 	conf = this->private;
+        if (!conf)
+                goto out;
 
 	for (i = 0; i < conf->subvolume_cnt; i++) {
 		if (subvol == conf->subvolumes[i]) {
@@ -399,6 +415,7 @@ dht_subvol_cnt (xlator_t *this, xlator_t *subvol)
 		}
 	}
 
+out:
 	return ret;
 }
 
diff --git a/xlators/cluster/dht/src/dht-layout.c b/xlators/cluster/dht/src/dht-layout.c
index a9ecc5874..a11b78f8d 100644
--- a/xlators/cluster/dht/src/dht-layout.c
+++ b/xlators/cluster/dht/src/dht-layout.c
@@ -72,6 +72,9 @@ dht_layout_get (xlator_t *this, inode_t *inode)
         int           ret    = -1;
 
         conf = this->private;
+        if (!conf)
+                goto out;
+
         LOCK (&conf->layout_lock);
         {
                 ret = inode_ctx_get (inode, this, &layout_int);
@@ -82,6 +85,7 @@ dht_layout_get (xlator_t *this, inode_t *inode)
         }
         UNLOCK (&conf->layout_lock);
 
+out:
         return layout;
 }
 
@@ -96,6 +100,9 @@ dht_layout_set (xlator_t *this, inode_t *inode, dht_layout_t *layout)
         uint64_t      old_layout_int;
 
         conf = this->private;
+        if (!conf)
+                goto out;
+
         LOCK (&conf->layout_lock);
         {
                 oldret = inode_ctx_get (inode, this, &old_layout_int);
@@ -111,6 +118,7 @@ dht_layout_set (xlator_t *this, inode_t *inode, dht_layout_t *layout)
                 dht_layout_unref (this, old_layout);
         }
 
+out:
         return ret;
 }
 
@@ -121,10 +129,11 @@ dht_layout_unref (xlator_t *this, dht_layout_t *layout)
         dht_conf_t  *conf = NULL;
         int          ref = 0;
 
-        if (layout->preset)
+        if (layout->preset || !this->private)
                 return;
 
         conf = this->private;
+
         LOCK (&conf->layout_lock);
         {
                 ref = --layout->ref;
@@ -141,7 +150,7 @@ dht_layout_ref (xlator_t *this, dht_layout_t *layout)
 {
         dht_conf_t  *conf = NULL;
 
-        if (layout->preset)
+        if (layout->preset || !this->private)
                 return layout;
 
         conf = this->private;
@@ -197,8 +206,9 @@ dht_layout_for_subvol (xlator_t *this, xlator_t *subvol)
 	dht_layout_t *layout = NULL;
 	int           i = 0;
 
-
 	conf = this->private;
+        if (!conf)
+                goto out;
 
 	for (i = 0; i < conf->subvolume_cnt; i++) {
 		if (conf->subvolumes[i] == subvol) {
@@ -207,6 +217,7 @@ dht_layout_for_subvol (xlator_t *this, xlator_t *subvol)
 		}
 	}
 
+out:
 	return layout;
 }
 
@@ -217,7 +228,9 @@ dht_layouts_init (xlator_t *this, dht_conf_t *conf)
 	dht_layout_t *layout = NULL;
 	int           i = 0;
 	int           ret = -1;
-	
+
+        if (!conf)
+                goto out;
 
 	conf->file_layouts = GF_CALLOC (conf->subvolume_cnt,
 				        sizeof (dht_layout_t *),
@@ -691,6 +704,8 @@ dht_layout_preset (xlator_t *this, xlator_t *subvol, inode_t *inode)
         dht_conf_t   *conf = NULL;
 
         conf = this->private;
+        if (!conf)
+                goto out;
 
 	layout = dht_layout_for_subvol (this, subvol);
 	if (!layout) {
diff --git a/xlators/cluster/dht/src/dht.c b/xlators/cluster/dht/src/dht.c
index 06623014a..2c2f17507 100644
--- a/xlators/cluster/dht/src/dht.c
+++ b/xlators/cluster/dht/src/dht.c
@@ -208,7 +208,7 @@ fini (xlator_t *this)
         dht_conf_t *conf = NULL;
 
 	conf = this->private;
-
+        this->private = NULL;
         if (conf) {
                 if (conf->file_layouts) {
                         for (i = 0; i < conf->subvolume_cnt; i++) {
@@ -262,6 +262,8 @@ reconfigure (xlator_t *this, dict_t *options)
 
 
 	conf = this->private;
+        if (!conf)
+                return 0;
 
 	if (dict_get_str (options, "lookup-unhashed", &temp_str) == 0) {
                 /* If option is not "auto", other options _should_ be boolean*/