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SUNRPC: Fix READ_PLUS crasher
commita23dd544de
upstream. Looks like there are still cases when "space_left - frag1bytes" can legitimately exceed PAGE_SIZE. Ensure that xdr->end always remains within the current encode buffer. Reported-by: Bruce Fields <bfields@fieldses.org> Reported-by: Zorro Lang <zlang@redhat.com> Link: https://bugzilla.kernel.org/show_bug.cgi?id=216151 Fixes:6c254bf3b6
("SUNRPC: Fix the calculation of xdr->end in xdr_get_next_encode_buffer()") Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -979,7 +979,7 @@ static __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr,
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*/
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xdr->p = (void *)p + frag2bytes;
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space_left = xdr->buf->buflen - xdr->buf->len;
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if (space_left - nbytes >= PAGE_SIZE)
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if (space_left - frag1bytes >= PAGE_SIZE)
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xdr->end = (void *)p + PAGE_SIZE;
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else
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xdr->end = (void *)p + space_left - frag1bytes;
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