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SUNRPC: Fix svcxdr_init_encode's buflen calculation
Commit2825a7f907
("nfsd4: allow encoding across page boundaries") added an explicit computation of the remaining length in the rq_res XDR buffer. The computation appears to suffer from an "off-by-one" bug. Because buflen is too large by one page, XDR encoding can run off the end of the send buffer by eventually trying to use the struct page address in rq_page_end, which always contains NULL. Fixes:bddfdbcddb
("NFSD: Extract the svcxdr_init_encode() helper") Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
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@ -587,7 +587,7 @@ static inline void svcxdr_init_encode(struct svc_rqst *rqstp)
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xdr->end = resv->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
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buf->len = resv->iov_len;
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xdr->page_ptr = buf->pages - 1;
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buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages);
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buf->buflen = PAGE_SIZE * (rqstp->rq_page_end - buf->pages);
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buf->buflen -= rqstp->rq_auth_slack;
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xdr->rqst = NULL;
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}
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