Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 2e11f829 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Trond Myklebust
Browse files

nfs: cap request size to fit a kmalloced page array 



pNFS servers may return arbitrarily large layouts.  Trim back the I/O size
to one that we can at least allocate the page array for.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent bc7d4b8f

fs/nfs/pagelist.c

+8 −0
Original line number Original line Diff line number Diff line
@@ -481,6 +481,14 @@ size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, 
		return 0;

		return 0;

	}

	}





	/*

	 * Limit the request size so that we can still allocate a page array

	 * for it without upsetting the slab allocator.

	 */

	if (((desc->pg_count + req->wb_bytes) >> PAGE_SHIFT) *

			sizeof(struct page) > PAGE_SIZE)

		return 0;



	return min(desc->pg_bsize - desc->pg_count, (size_t)req->wb_bytes);

	return min(desc->pg_bsize - desc->pg_count, (size_t)req->wb_bytes);

}

}

EXPORT_SYMBOL_GPL(nfs_generic_pg_test);

EXPORT_SYMBOL_GPL(nfs_generic_pg_test);