Commit bb6e8a9f authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
Browse files

[PATCH] knfsd: nfsd4: fix corruption on readdir encoding with 64k pages



Fix corruption on readdir encoding with 64k pages.
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 6ed6decc
......@@ -2157,7 +2157,7 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_re
{
int maxcount;
loff_t offset;
u32 *page, *savep;
u32 *page, *savep, *tailbase;
ENCODE_HEAD;
if (nfserr)
......@@ -2173,6 +2173,7 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_re
WRITE32(0);
ADJUST_ARGS();
resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
tailbase = p;
maxcount = PAGE_SIZE;
if (maxcount > readdir->rd_maxcount)
......@@ -2217,14 +2218,12 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_re
*p++ = htonl(readdir->common.err == nfserr_eof);
resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
/* allocate a page for the tail */
svc_take_page(resp->rqstp);
resp->xbuf->tail[0].iov_base =
page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
/* Use rest of head for padding and remaining ops: */
resp->rqstp->rq_restailpage = 0;
resp->xbuf->tail[0].iov_base = tailbase;
resp->xbuf->tail[0].iov_len = 0;
resp->p = resp->xbuf->tail[0].iov_base;
resp->end = resp->p + PAGE_SIZE/4;
resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
return 0;
err_no_verf:
......
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