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NFS - fix potential NULL pointer dereference v2

There is possible NULL pointer dereference if kstr[n]dup failed.
So fix them for safety.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
master
Cyrill Gorcunov 14 years ago
committed by Trond Myklebust
parent
commit
63649bd708
  1. 16
      fs/nfs/super.c

16
fs/nfs/super.c

@ -1297,6 +1297,8 @@ static int nfs_validate_mount_data(void *options,
args->namlen = data->namlen;
args->bsize = data->bsize;
args->auth_flavors[0] = data->pseudoflavor;
if (!args->nfs_server.hostname)
goto out_nomem;
/*
* The legacy version 6 binary mount data from userspace has a
@ -1343,6 +1345,8 @@ static int nfs_validate_mount_data(void *options,
len = c - dev_name;
/* N.B. caller will free nfs_server.hostname in all cases */
args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
if (!args->nfs_server.hostname)
goto out_nomem;
c++;
if (strlen(c) > NFS_MAXPATHLEN)
@ -1386,6 +1390,10 @@ out_v3_not_compiled:
return -EPROTONOSUPPORT;
#endif /* !CONFIG_NFS_V3 */
out_nomem:
dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
return -ENOMEM;
out_no_address:
dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
return -EINVAL;
@ -1892,12 +1900,16 @@ static int nfs4_validate_mount_data(void *options,
return -ENAMETOOLONG;
/* N.B. caller will free nfs_server.hostname in all cases */
args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
if (!args->nfs_server.hostname)
goto out_nomem;
c++; /* step over the ':' */
len = strlen(c);
if (len > NFS4_MAXPATHLEN)
return -ENAMETOOLONG;
args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
if (!args->nfs_server.export_path)
goto out_nomem;
dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
@ -1919,6 +1931,10 @@ out_inval_auth:
data->auth_flavourlen);
return -EINVAL;
out_nomem:
dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
return -ENOMEM;
out_no_address:
dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
return -EINVAL;

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