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-rw-r--r--fs/nfsd/nfs4xdr.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 7ec646380005..eeea7a90eb87 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2688,6 +2688,7 @@ nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
struct xdr_stream *xdr = cd->xdr;
int start_offset = xdr->buf->len;
int cookie_offset;
+ u32 name_and_cookie;
int entry_bytes;
__be32 nfserr = nfserr_toosmall;
__be64 wire_offset;
@@ -2749,7 +2750,14 @@ nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
cd->rd_maxcount -= entry_bytes;
if (!cd->rd_dircount)
goto fail;
- cd->rd_dircount--;
+ /*
+ * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
+ * let's always let through the first entry, at least:
+ */
+ name_and_cookie = 4 * XDR_QUADLEN(namlen) + 8;
+ if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
+ goto fail;
+ cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
cd->cookie_offset = cookie_offset;
skip_entry:
cd->common.err = nfs_ok;
@@ -3127,7 +3135,8 @@ static __be32 nfsd4_encode_splice_read(
buf->page_len = maxcount;
buf->len += maxcount;
- xdr->page_ptr += (maxcount + PAGE_SIZE - 1) / PAGE_SIZE;
+ xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
+ / PAGE_SIZE;
/* Use rest of head for padding and remaining ops: */
buf->tail[0].iov_base = xdr->p;
@@ -3352,6 +3361,10 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
}
maxcount = min_t(int, maxcount-16, bytes_left);
+ /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
+ if (!readdir->rd_dircount)
+ readdir->rd_dircount = INT_MAX;
+
readdir->xdr = xdr;
readdir->rd_maxcount = maxcount;
readdir->common.err = 0;