• Yao Liu's avatar
    nfs: Fix NULL pointer dereference of dev_name · 80ff0017
    Yao Liu authored
    There is a NULL pointer dereference of dev_name in nfs_parse_devname()
    
    The oops looks something like:
    
      BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
      ...
      RIP: 0010:nfs_fs_mount+0x3b6/0xc20 [nfs]
      ...
      Call Trace:
       ? ida_alloc_range+0x34b/0x3d0
       ? nfs_clone_super+0x80/0x80 [nfs]
       ? nfs_free_parsed_mount_data+0x60/0x60 [nfs]
       mount_fs+0x52/0x170
       ? __init_waitqueue_head+0x3b/0x50
       vfs_kern_mount+0x6b/0x170
       do_mount+0x216/0xdc0
       ksys_mount+0x83/0xd0
       __x64_sys_mount+0x25/0x30
       do_syscall_64+0x65/0x220
       entry_SYSCALL_64_after_hwframe+0x49/0xbe
    
    Fix this by adding a NULL check on dev_name
    Signed-off-by: default avatarYao Liu <yotta.liu@ucloud.cn>
    Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
    80ff0017
super.c 75.8 KB