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authorNeilBrown <neilb@suse.de>2007-01-26 00:56:59 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-26 13:50:59 -0800
commit250f3915183d377d36e012bac9caa7345ce465b8 (patch)
treee7fd20dfa79a8b4f6435083bf48f4cd3d1836cbf /fs/nfsd
parent1a8eff6d977c28162c61c9532ca58634e7090b69 (diff)
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[PATCH] knfsd: fix an NFSD bug with full sized, non-page-aligned reads
NFSd assumes that largest number of pages that will be needed for a request+response is 2+N where N pages is the size of the largest permitted read/write request. The '2' are 1 for the non-data part of the request, and 1 for the non-data part of the reply. However, when a read request is not page-aligned, and we choose to use ->sendfile to send it directly from the page cache, we may need N+1 pages to hold the whole reply. This can overflow and array and cause an Oops. This patch increases size of the array for holding pages by one and makes sure that entry is NULL when it is not in use. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/vfs.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 7a79c23..ea85562 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -822,7 +822,8 @@ nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset
rqstp->rq_res.page_len = size;
} else if (page != pp[-1]) {
get_page(page);
- put_page(*pp);
+ if (*pp)
+ put_page(*pp);
*pp = page;
rqstp->rq_resused++;
rqstp->rq_res.page_len += size;