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authorTrond Myklebust <trond.myklebust@primarydata.com>2017-09-08 21:28:11 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-09-13 14:09:46 -0700
commit677a803640497d489406ba708608aa9de7755bb0 (patch)
tree1519d6349b7c6d4984aab72d239b3d26031d964c
parent84478477d0b8572c6d267492aaaf49acd6fc4db5 (diff)
downloadlinux-linaro-stable-677a803640497d489406ba708608aa9de7755bb0.tar.gz
NFS: Fix 2 use after free issues in the I/O code
commit 196639ebbe63a037fe9a80669140bd292d8bcd80 upstream. The writeback code wants to send a commit after processing the pages, which is why we want to delay releasing the struct path until after that's done. Also, the layout code expects that we do not free the inode before we've put the layout segments in pnfs_writehdr_free() and pnfs_readhdr_free() Fixes: 919e3bd9a875 ("NFS: Ensure we commit after writeback is complete") Fixes: 4714fb51fd03 ("nfs: remove pgio_header refcount, related cleanup") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/nfs/internal.h1
-rw-r--r--fs/nfs/pagelist.c26
-rw-r--r--fs/nfs/pnfs.c2
3 files changed, 12 insertions, 17 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 9dea85f..578350f 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -243,7 +243,6 @@ int nfs_iocounter_wait(struct nfs_io_counter *c);
extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
void nfs_pgio_header_free(struct nfs_pgio_header *);
-void nfs_pgio_data_destroy(struct nfs_pgio_header *);
int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 452a011..8ebfdd0 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -528,16 +528,6 @@ struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *ops)
}
EXPORT_SYMBOL_GPL(nfs_pgio_header_alloc);
-/*
- * nfs_pgio_header_free - Free a read or write header
- * @hdr: The header to free
- */
-void nfs_pgio_header_free(struct nfs_pgio_header *hdr)
-{
- hdr->rw_ops->rw_free_header(hdr);
-}
-EXPORT_SYMBOL_GPL(nfs_pgio_header_free);
-
/**
* nfs_pgio_data_destroy - make @hdr suitable for reuse
*
@@ -546,14 +536,24 @@ EXPORT_SYMBOL_GPL(nfs_pgio_header_free);
*
* @hdr: A header that has had nfs_generic_pgio called
*/
-void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr)
+static void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr)
{
if (hdr->args.context)
put_nfs_open_context(hdr->args.context);
if (hdr->page_array.pagevec != hdr->page_array.page_array)
kfree(hdr->page_array.pagevec);
}
-EXPORT_SYMBOL_GPL(nfs_pgio_data_destroy);
+
+/*
+ * nfs_pgio_header_free - Free a read or write header
+ * @hdr: The header to free
+ */
+void nfs_pgio_header_free(struct nfs_pgio_header *hdr)
+{
+ nfs_pgio_data_destroy(hdr);
+ hdr->rw_ops->rw_free_header(hdr);
+}
+EXPORT_SYMBOL_GPL(nfs_pgio_header_free);
/**
* nfs_pgio_rpcsetup - Set up arguments for a pageio call
@@ -671,7 +671,6 @@ static int nfs_pgio_error(struct nfs_pageio_descriptor *desc,
u32 midx;
set_bit(NFS_IOHDR_REDO, &hdr->flags);
- nfs_pgio_data_destroy(hdr);
hdr->completion_ops->completion(hdr);
/* TODO: Make sure it's right to clean up all mirrors here
* and not just hdr->pgio_mirror_idx */
@@ -689,7 +688,6 @@ static int nfs_pgio_error(struct nfs_pageio_descriptor *desc,
static void nfs_pgio_release(void *calldata)
{
struct nfs_pgio_header *hdr = calldata;
- nfs_pgio_data_destroy(hdr);
hdr->completion_ops->completion(hdr);
}
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 3cae072..7af7bed 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1943,7 +1943,6 @@ pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
nfs_pageio_reset_write_mds(desc);
mirror->pg_recoalesce = 1;
}
- nfs_pgio_data_destroy(hdr);
hdr->release(hdr);
}
@@ -2059,7 +2058,6 @@ pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
nfs_pageio_reset_read_mds(desc);
mirror->pg_recoalesce = 1;
}
- nfs_pgio_data_destroy(hdr);
hdr->release(hdr);
}