Commit 63649bd7 authored by Cyrill Gorcunov's avatar Cyrill Gorcunov Committed by Trond Myklebust
Browse files

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: default avatarCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent cd019f75

fs/nfs/super.c

+16 −0
Original line number Diff line number Diff line
@@ -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 @@ static int nfs_validate_mount_data(void *options, 
	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 @@ static int nfs4_validate_mount_data(void *options, 
		 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;