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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-06-20 22:35:05 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-06-28 17:20:43 -0400
commit64bd577ea0021f5903505de061b3b7d8a785ee94 (patch)
tree7081480d903325bb82d2384b69cff4579f289de1 /fs/nfs/nfs2xdr.c
parentc337d3655ce85e12c7c476cb81406521926cacd2 (diff)
downloadlinux-64bd577ea0021f5903505de061b3b7d8a785ee94.tar.bz2
NFS: Let xdr_read_pages() check for buffer overflows
xdr_read_pages will already do all of the buffer overflow checks that are currently being open-coded in the various callers. This patch simplifies the existing code by replacing the open coded checks. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/nfs2xdr.c')
-rw-r--r--fs/nfs/nfs2xdr.c22
1 files changed, 3 insertions, 19 deletions
diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index db81166182c9..d04f0df7be55 100644
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -106,19 +106,16 @@ static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
static int decode_nfsdata(struct xdr_stream *xdr, struct nfs_readres *result)
{
u32 recvd, count;
- size_t hdrlen;
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
count = be32_to_cpup(p);
- hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
- recvd = xdr->buf->len - hdrlen;
+ recvd = xdr_read_pages(xdr, count);
if (unlikely(count > recvd))
goto out_cheating;
out:
- xdr_read_pages(xdr, count);
result->eof = 0; /* NFSv2 does not pass EOF flag on the wire. */
result->count = count;
return count;
@@ -440,7 +437,6 @@ static void encode_path(struct xdr_stream *xdr, struct page **pages, u32 length)
static int decode_path(struct xdr_stream *xdr)
{
u32 length, recvd;
- size_t hdrlen;
__be32 *p;
p = xdr_inline_decode(xdr, 4);
@@ -449,12 +445,9 @@ static int decode_path(struct xdr_stream *xdr)
length = be32_to_cpup(p);
if (unlikely(length >= xdr->buf->page_len || length > NFS_MAXPATHLEN))
goto out_size;
- hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
- recvd = xdr->buf->len - hdrlen;
+ recvd = xdr_read_pages(xdr, length);
if (unlikely(length > recvd))
goto out_cheating;
-
- xdr_read_pages(xdr, length);
xdr_terminate_string(xdr->buf, length);
return 0;
out_size:
@@ -972,16 +965,7 @@ out_overflow:
*/
static int decode_readdirok(struct xdr_stream *xdr)
{
- u32 recvd, pglen;
- size_t hdrlen;
-
- pglen = xdr->buf->page_len;
- hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
- recvd = xdr->buf->len - hdrlen;
- if (pglen > recvd)
- pglen = recvd;
- xdr_read_pages(xdr, pglen);
- return pglen;
+ return xdr_read_pages(xdr, xdr->buf->page_len);
}
static int nfs2_xdr_dec_readdirres(struct rpc_rqst *req,