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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-03-19 12:36:53 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-05 10:16:38 -0700 |
| commit | 01b140abad66f022ff6dff7cc1307b07281035fa (patch) | |
| tree | 0bcc23968e52a00d9cbdc8e729946938f644a7c1 | |
| parent | c938c22b48302eeb9a6f3cc83f223f37d98ba6f7 (diff) | |
| download | kernel_samsung_smdk4412-01b140abad66f022ff6dff7cc1307b07281035fa.zip kernel_samsung_smdk4412-01b140abad66f022ff6dff7cc1307b07281035fa.tar.gz kernel_samsung_smdk4412-01b140abad66f022ff6dff7cc1307b07281035fa.tar.bz2 | |
NFSv4: Fix an Oops in the NFSv4 getacl code
commit 331818f1c468a24e581aedcbe52af799366a9dfe upstream.
Commit bf118a342f10dafe44b14451a1392c3254629a1f (NFSv4: include bitmap
in nfsv4 get acl data) introduces the 'acl_scratch' page for the case
where we may need to decode multi-page data. However it fails to take
into account the fact that the variable may be NULL (for the case where
we're not doing multi-page decode), and it also attaches it to the
encoding xdr_stream rather than the decoding one.
The immediate result is an Oops in nfs4_xdr_enc_getacl due to the
call to page_address() with a NULL page pointer.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Andy Adamson <andros@netapp.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/nfs/nfs4proc.c | 8 | ||||
| -rw-r--r-- | fs/nfs/nfs4xdr.c | 5 | ||||
| -rw-r--r-- | include/linux/nfs_xdr.h | 2 |
3 files changed, 9 insertions, 6 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 7090b21..50ec294 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -3578,8 +3578,8 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu } if (npages > 1) { /* for decoding across pages */ - args.acl_scratch = alloc_page(GFP_KERNEL); - if (!args.acl_scratch) + res.acl_scratch = alloc_page(GFP_KERNEL); + if (!res.acl_scratch) goto out_free; } args.acl_len = npages * PAGE_SIZE; @@ -3615,8 +3615,8 @@ out_free: for (i = 0; i < npages; i++) if (pages[i]) __free_page(pages[i]); - if (args.acl_scratch) - __free_page(args.acl_scratch); + if (res.acl_scratch) + __free_page(res.acl_scratch); return ret; } diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index c557734..4204e96 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -2379,7 +2379,6 @@ static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr, xdr_inline_pages(&req->rq_rcv_buf, replen << 2, args->acl_pages, args->acl_pgbase, args->acl_len); - xdr_set_scratch_buffer(xdr, page_address(args->acl_scratch), PAGE_SIZE); encode_nops(&hdr); } @@ -5688,6 +5687,10 @@ nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr, struct compound_hdr hdr; int status; + if (res->acl_scratch != NULL) { + void *p = page_address(res->acl_scratch); + xdr_set_scratch_buffer(xdr, p, PAGE_SIZE); + } status = decode_compound_hdr(xdr, &hdr); if (status) goto out; diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index 2b25494..9733df5 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -588,7 +588,6 @@ struct nfs_getaclargs { size_t acl_len; unsigned int acl_pgbase; struct page ** acl_pages; - struct page * acl_scratch; struct nfs4_sequence_args seq_args; }; @@ -598,6 +597,7 @@ struct nfs_getaclres { size_t acl_len; size_t acl_data_offset; int acl_flags; + struct page * acl_scratch; struct nfs4_sequence_res seq_res; }; |