From: NeilBrown Date: Tue, 11 Apr 2006 05:55:34 +0000 (-0700) Subject: [PATCH] knfsd: svcrpc: gss: don't call svc_take_page unnecessarily X-Git-Tag: v2.6.17-rc2~120 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dfee55f06213a23b250ea63ba41caa461cdd5e72;p=linux-2.6 [PATCH] knfsd: svcrpc: gss: don't call svc_take_page unnecessarily We're using svc_take_page here to get another page for the tail in case one wasn't already allocated. But there isn't always guaranteed to be another page available. Also fix a typo that made us check the tail buffer for space when we meant to be checking the head buffer. Signed-off-by: J. Bruce Fields Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c index 4d7eb9e704..d51e316c58 100644 --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -1122,18 +1122,20 @@ svcauth_gss_release(struct svc_rqst *rqstp) integ_len)) BUG(); if (resbuf->page_len == 0 - && resbuf->tail[0].iov_len + RPC_MAX_AUTH_SIZE + && resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE < PAGE_SIZE) { BUG_ON(resbuf->tail[0].iov_len); /* Use head for everything */ resv = &resbuf->head[0]; } else if (resbuf->tail[0].iov_base == NULL) { - /* copied from nfsd4_encode_read */ - svc_take_page(rqstp); - resbuf->tail[0].iov_base = page_address(rqstp - ->rq_respages[rqstp->rq_resused-1]); - rqstp->rq_restailpage = rqstp->rq_resused-1; + if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE + > PAGE_SIZE) + goto out_err; + resbuf->tail[0].iov_base = + resbuf->head[0].iov_base + + resbuf->head[0].iov_len; resbuf->tail[0].iov_len = 0; + rqstp->rq_restailpage = 0; resv = &resbuf->tail[0]; } else { resv = &resbuf->tail[0];