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NFS: Guard against READDIR loop when entry names exceed MAXNAMELEN 

Commit 64cfca85ba asserts the only valid return values for
nfs2/3_decode_dirent should not include -ENAMETOOLONG, but for a server
that sends a filename3 which exceeds MAXNAMELEN in a READDIR response the
client's behavior will be to endlessly retry the operation.

We could map -ENAMETOOLONG into -EBADCOOKIE, but that would produce
truncated listings without any error.  The client should return an error
for this case to clearly assert that the server implementation must be
corrected.

Fixes: 64cfca85ba ("NFS: Return valid errors from nfs2/3_decode_dirent()")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Benjamin Coddington 2023-08-22 14:22:38 -04:00 committed by Anna Schumaker
parent 51d674a5e4
commit f67b55b658
2 changed files with 2 additions and 2 deletions
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2
fs/nfs/nfs2xdr.c
View File

@ -949,7 +949,7 @@ int nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
error = decode_filename_inline(xdr, &entry->name, &entry->len);
if (unlikely(error))
return -EAGAIN;
return error == -ENAMETOOLONG ? -ENAMETOOLONG : -EAGAIN;
/*
* The type (size and byte order) of nfscookie isn't defined in

2
fs/nfs/nfs3xdr.c
View File

@ -1991,7 +1991,7 @@ int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
error = decode_inline_filename3(xdr, &entry->name, &entry->len);
if (unlikely(error))
return -EAGAIN;
return error == -ENAMETOOLONG ? -ENAMETOOLONG : -EAGAIN;
error = decode_cookie3(xdr, &new_cookie);
if (unlikely(error))