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[PATCH] knfsd: svcrpc: WARN() instead of returning an error from svc_take_page

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Every caller of svc_take_page ignores its return value and assumes it
succeeded.  So just WARN() instead of returning an ignored error.  This would
have saved some time debugging a recent nfsd4 problem.

If there are still failure cases here, then the result is probably that we
overwrite an earlier part of the reply while xdr-encoding.

While the corrupted reply is a nasty bug, it would be worse to panic here and
create the possibility of a remote DOS; hence WARN() instead of BUG().

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Cc: Ingo Oeser <ioe-lkml@rameria.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
J. Bruce Fields 2006-04-10 22:55:36 -07:00 committed by Linus Torvalds
parent dfee55f062
commit 6f54e2d0d3
1 changed files with 5 additions and 4 deletions
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9
include/linux/sunrpc/svc.h
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@ -197,15 +197,16 @@ svc_take_res_page(struct svc_rqst *rqstp)
return rqstp->rq_respages[rqstp->rq_resused++];
}
static inline int svc_take_page(struct svc_rqst *rqstp)
static inline void svc_take_page(struct svc_rqst *rqstp)
{
if (rqstp->rq_arghi <= rqstp->rq_argused)
return -ENOMEM;
if (rqstp->rq_arghi <= rqstp->rq_argused) {
WARN_ON(1);
return;
}
rqstp->rq_arghi--;
rqstp->rq_respages[rqstp->rq_resused] =
rqstp->rq_argpages[rqstp->rq_arghi];
rqstp->rq_resused++;
return 0;
}
static inline void svc_pushback_allpages(struct svc_rqst *rqstp)