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| author |   Yao Liu <yotta.liu@ucloud.cn> | 2019-01-28 19:44:14 +0800 |
|---|---|---|
| committer |   Anna Schumaker <Anna.Schumaker@Netapp.com> | 2019-01-28 12:08:30 -0500 |
| commit | 80ff00172407e0aad4b10b94ef0816fc3e7813cb (patch) | |
| tree | 151d59746e33a568ce49af3eba15275668ad40ae /fs | |
| parent | SUNRPC: Address Kerberos performance/behavior regression (diff) | |
| download | linux-dev-80ff00172407e0aad4b10b94ef0816fc3e7813cb.tar.xz linux-dev-80ff00172407e0aad4b10b94ef0816fc3e7813cb.zip | |
nfs: Fix NULL pointer dereference of dev_name
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: Yao Liu <yotta.liu@ucloud.cn>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/super.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 22ce3c8a2f46..0570391eaa16 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -1895,6 +1895,11 @@ static int nfs_parse_devname(const char *dev_name, size_t len; char *end; + if (unlikely(!dev_name || !*dev_name)) { + dfprintk(MOUNT, "NFS: device name not specified\n"); + return -EINVAL; + } + /* Is the host name protected with square brakcets? */ if (*dev_name == '[') { end = strchr(++dev_name, ']'); |