diff mbox series

[49/52] fuse: don't crash if version table is NULL

Message ID 20181210171318.16998-50-vgoyal@redhat.com (mailing list archive)
State New, archived
Headers show
Series virtio-fs: shared file system for virtual machines | expand

Commit Message

Vivek Goyal Dec. 10, 2018, 5:13 p.m. UTC 
From: Miklos Szeredi <mszeredi@redhat.com>

Version table can be NULL. Do not crash.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---
 fs/fuse/inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 1ab4df442390..d44827bbfa3d 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1219,7 +1219,8 @@  int fuse_fill_super_common(struct super_block *sb,
 	fc->version_table_size = mount_data->vertab_len / sizeof(s64);
 	fc->version_table = mount_data->vertab_kaddr;
 
-	if (fc->version_table[0] != VERSION_TABLE_MAGIC) {
+	if (fc->version_table && fc->version_table_size > 0 &&
+	    fc->version_table[0] != VERSION_TABLE_MAGIC) {
 		pr_warn("bad version table magic: 0x%16llx\n",
 			fc->version_table[0]);
 		fc->version_table_size = 0;