From: Chuck Lever Date: Tue, 7 Jun 2022 20:47:52 +0000 (-0400) Subject: SUNRPC: Fix the calculation of xdr->end in xdr_get_next_encode_buffer() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6dda4426fa772672883c5f67f9e282b8a3e8a8df;p=linux.git SUNRPC: Fix the calculation of xdr->end in xdr_get_next_encode_buffer() [ Upstream commit 6c254bf3b637dd4ef4f78eb78c7447419c0161d7 ] I found that NFSD's new NFSv3 READDIRPLUS XDR encoder was screwing up right at the end of the page array. xdr_get_next_encode_buffer() does not compute the value of xdr->end correctly: * The check to see if we're on the final available page in xdr->buf needs to account for the space consumed by @nbytes. * The new xdr->end value needs to account for the portion of @nbytes that is to be encoded into the previous buffer. Fixes: 2825a7f90753 ("nfsd4: allow encoding across page boundaries") Signed-off-by: Chuck Lever Reviewed-by: NeilBrown Reviewed-by: J. Bruce Fields Signed-off-by: Sasha Levin --- diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c index ca10ba2626f27..85473264cccfb 100644 --- a/net/sunrpc/xdr.c +++ b/net/sunrpc/xdr.c @@ -979,7 +979,11 @@ static __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr, */ xdr->p = (void *)p + frag2bytes; space_left = xdr->buf->buflen - xdr->buf->len; - xdr->end = (void *)p + min_t(int, space_left, PAGE_SIZE); + if (space_left - nbytes >= PAGE_SIZE) + xdr->end = (void *)p + PAGE_SIZE; + else + xdr->end = (void *)p + space_left - frag1bytes; + xdr->buf->page_len += frag2bytes; xdr->buf->len += nbytes; return p;