svn commit: r345986 - head/sys/fs/fuse

[Alan Somers]

Author: asomers
Date: Sat Apr  6 18:04:04 2019
New Revision: 345986
URL: https://svnweb.freebsd.org/changeset/base/345986

Log:
  fusefs: fix a panic on mount
  
  Don't page fault if the file descriptor provided with "-o fd" is invalid.
  This is a merge of r345419 from the projects/fuse2 branch.
  
  Reviewed by:	ngie
  Tested by:	Marek Zarychta <zarychtam at plan-b.pwste.edu.pl>
  MFC after:	2 weeks
  Sponsored by: The FreeBSD Foundation
  Differential Revision:	https://reviews.freebsd.org/D19836

Modified:
  head/sys/fs/fuse/fuse_vfsops.c

Modified: head/sys/fs/fuse/fuse_vfsops.c
==============================================================================
--- head/sys/fs/fuse/fuse_vfsops.c	Sat Apr  6 17:21:05 2019	(r345985)
+++ head/sys/fs/fuse/fuse_vfsops.c	Sat Apr  6 18:04:04 2019	(r345986)
@@ -225,7 +225,7 @@ fuse_vfsop_mount(struct mount *mp)
 	size_t len;
 
 	struct cdev *fdev;
-	struct fuse_data *data;
+	struct fuse_data *data = NULL;
 	struct thread *td;
 	struct file *fp, *fptmp;
 	char *fspec, *subtype;
@@ -361,7 +361,7 @@ fuse_vfsop_mount(struct mount *mp)
 out:
 	if (err) {
 		FUSE_LOCK();
-		if (data->mp == mp) {
+		if (data != NULL && data->mp == mp) {
 			/*
 			 * Destroy device only if we acquired reference to
 			 * it