fix memory management of current mailbox name

it was a stupid idea to store the pointer to a variable we need to
dispose in a structure which has its own lifetime.

src/driver.h

@@ -87,7 +87,6 @@ typedef struct store {
 
 	/* currently open mailbox */
 	const char *orig_name; /* foreign! maybe preset? */
-	char *name; /* foreign! maybe preset? */
 	char *path; /* own */
 	message_t *msgs; /* own */
 	int uidvalidity;
@@ -168,9 +167,9 @@ struct driver {
 	 * needed or available operations. */
 	void (*prepare_opts)( store_t *ctx, int opts );
 
-	/* Open the mailbox ctx->name. Optionally create missing boxes.
+	/* Open the mailbox name. Optionally create missing boxes.
 	 * As a side effect, this should resolve ctx->path if applicable. */
-	void (*select)( store_t *ctx, int create,
+	void (*select)( store_t *ctx, const char *name, int create,
 	               void (*cb)( int sts, void *aux ), void *aux );
 
 	/* Load the message attributes needed to perform the requested operations.

src/drv_imap.c

@@ -88,6 +88,7 @@ typedef struct imap_store {
 	store_t gen;
 	const char *label; /* foreign */
 	const char *prefix;
+	const char *name;
 	int ref_count;
 	/* trash folder's existence is not confirmed yet */
 	enum { TrashUnknown, TrashChecking, TrashKnown } trashnc;
@@ -1136,7 +1137,7 @@ prepare_name( char **buf, const imap_store_t *ctx, const char *prefix, const cha
 static int
 prepare_box( char **buf, const imap_store_t *ctx )
 {
-	const char *name = ctx->gen.name;
+	const char *name = ctx->name;
 
 	return prepare_name( buf, ctx,
 	    (starts_with( name, -1, "INBOX", 5 ) && (!name[5] || name[5] == '/')) ? "" : ctx->prefix, name );
@@ -1828,7 +1829,7 @@ imap_prepare_opts( store_t *gctx, int opts )
 /******************* imap_select *******************/
 
 static void
-imap_select( store_t *gctx, int create,
+imap_select( store_t *gctx, const char *name, int create,
              void (*cb)( int sts, void *aux ), void *aux )
 {
 	imap_store_t *ctx = (imap_store_t *)gctx;
@@ -1839,6 +1840,7 @@ imap_select( store_t *gctx, int create,
 	gctx->msgs = 0;
 	ctx->msgapp = &gctx->msgs;
 
+	ctx->name = name;
 	if (prepare_box( &buf, ctx ) < 0) {
 		cb( DRV_BOX_BAD, aux );
 		return;

src/drv_maildir.c

@@ -924,7 +924,7 @@ maildir_app_msg( maildir_store_t *ctx, message_t ***msgapp, msg_t *entry )
 }
 
 static void
-maildir_select( store_t *gctx, int create,
+maildir_select( store_t *gctx, const char *name, int create,
                 void (*cb)( int sts, void *aux ), void *aux )
 {
 	maildir_store_t *ctx = (maildir_store_t *)gctx;
@@ -941,15 +941,15 @@ maildir_select( store_t *gctx, int create,
 #ifdef USE_DB
 	ctx->db = 0;
 #endif /* USE_DB */
-	if (starts_with( gctx->name, -1, "INBOX", 5 ) && (!gctx->name[5] || gctx->name[5] == '/')) {
-		gctx->path = maildir_join_path( ((maildir_store_conf_t *)gctx->conf)->inbox, gctx->name + 5 );
+	if (starts_with( name, -1, "INBOX", 5 ) && (!name[5] || name[5] == '/')) {
+		gctx->path = maildir_join_path( ((maildir_store_conf_t *)gctx->conf)->inbox, name + 5 );
 	} else {
 		if (maildir_validate_path( gctx->conf ) < 0) {
 			maildir_invoke_bad_callback( gctx );
 			cb( DRV_CANCELED, aux );
 			return;
 		}
-		gctx->path = maildir_join_path( gctx->conf->path, gctx->name );
+		gctx->path = maildir_join_path( gctx->conf->path, name );
 	}
 
 	if ((ret = maildir_validate( gctx->path, create, ctx )) != DRV_OK) {

src/sync.c

@@ -147,7 +147,7 @@ typedef struct sync_rec {
 typedef struct {
 	int t[2];
 	void (*cb)( int sts, void *aux ), *aux;
-	char *dname, *jname, *nname, *lname;
+	char *dname, *jname, *nname, *lname, *box_name[2];
 	FILE *jfp, *nfp;
 	sync_rec_t *srecs, **srecadd;
 	channel_conf_t *chan;
@@ -598,14 +598,13 @@ sync_boxes( store_t *ctx[], const char *names[], channel_conf_t *chan,
 	svars->uidval[0] = svars->uidval[1] = -1;
 	svars->srecadd = &svars->srecs;
 
-	ctx[0]->name = ctx[1]->name = 0;
 	for (t = 0; t < 2; t++) {
 		ctx[t]->orig_name =
 			(!names[t] || (ctx[t]->conf->map_inbox && !strcmp( ctx[t]->conf->map_inbox, names[t] ))) ?
 				"INBOX" : names[t];
 		if (!ctx[t]->conf->flat_delim) {
-			ctx[t]->name = nfstrdup( ctx[t]->orig_name );
-		} else if (map_name( ctx[t]->orig_name, &ctx[t]->name, 0, "/", ctx[t]->conf->flat_delim ) < 0) {
+			svars->box_name[t] = nfstrdup( ctx[t]->orig_name );
+		} else if (map_name( ctx[t]->orig_name, &svars->box_name[t], 0, "/", ctx[t]->conf->flat_delim ) < 0) {
 			error( "Error: canonical mailbox name '%s' contains flattened hierarchy delimiter\n", ctx[t]->orig_name );
 			svars->ret = SYNC_FAIL;
 			sync_bail3( svars );
@@ -620,7 +619,7 @@ sync_boxes( store_t *ctx[], const char *names[], channel_conf_t *chan,
 	sync_ref( svars );
 	for (t = 0; t < 2; t++) {
 		info( "Selecting %s %s...\n", str_ms[t], ctx[t]->orig_name );
-		svars->drv[t]->select( ctx[t], (chan->ops[t] & OP_CREATE) != 0, box_selected, AUX );
+		svars->drv[t]->select( ctx[t], svars->box_name[t], (chan->ops[t] & OP_CREATE) != 0, box_selected, AUX );
 		if (check_cancel( svars ))
 			break;
 	}
@@ -665,11 +664,11 @@ box_selected( int sts, void *aux )
 		}
 		nfasprintf( &svars->dname, "%s/." EXE "state", ctx[S]->path );
 	} else {
-		csname = clean_strdup( ctx[S]->name );
+		csname = clean_strdup( svars->box_name[S] );
 		if (chan->sync_state)
 			nfasprintf( &svars->dname, "%s%s", chan->sync_state, csname );
 		else {
-			cmname = clean_strdup( ctx[M]->name );
+			cmname = clean_strdup( svars->box_name[M] );
 			nfasprintf( &svars->dname, "%s:%s:%s_:%s:%s", global_conf.sync_state,
 			            chan->stores[M]->name, cmname, chan->stores[S]->name, csname );
 			free( cmname );
@@ -1919,8 +1918,8 @@ sync_bail2( sync_vars_t *svars )
 static void
 sync_bail3( sync_vars_t *svars )
 {
-	free( svars->ctx[M]->name );
-	free( svars->ctx[S]->name );
+	free( svars->box_name[M] );
+	free( svars->box_name[S] );
 	sync_deref( svars );
 }