linux-kernel - [PATCH 3/4] nfs: pass the correct prototype to read_cache

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Message-Id: <20190501160636.30841-4-hch@lst.de>
Date:   Wed,  1 May 2019 12:06:35 -0400
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-mtd@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] nfs: pass the correct prototype to read_cache_page

Fix the callbacks NFS passes to read_cache_page to actually have the
proper type expected.  Casting around function pointers can easily
hide typing bugs, and defeats control flow protection.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/nfs/dir.c     | 7 ++++---
 fs/nfs/symlink.c | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index a71d0b42d160..47d445bec8c9 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -714,8 +714,9 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
  * We only need to convert from xdr once so future lookups are much simpler
  */
 static
-int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
+int nfs_readdir_filler(void *data, struct page* page)
 {
+	nfs_readdir_descriptor_t *desc = data;
 	struct inode	*inode = file_inode(desc->file);
 	int ret;
 
@@ -762,8 +763,8 @@ void cache_page_release(nfs_readdir_descriptor_t *desc)
 static
 struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
 {
-	return read_cache_page(desc->file->f_mapping,
-			desc->page_index, (filler_t *)nfs_readdir_filler, desc);
+	return read_cache_page(desc->file->f_mapping, desc->page_index,
+			nfs_readdir_filler, desc);
 }
 
 /*
diff --git a/fs/nfs/symlink.c b/fs/nfs/symlink.c
index 06eb44b47885..25ba299fdac2 100644
--- a/fs/nfs/symlink.c
+++ b/fs/nfs/symlink.c
@@ -26,8 +26,9 @@
  * and straight-forward than readdir caching.
  */
 
-static int nfs_symlink_filler(struct inode *inode, struct page *page)
+static int nfs_symlink_filler(void *data, struct page *page)
 {
+	struct inode *inode = data;
 	int error;
 
 	error = NFS_PROTO(inode)->readlink(inode, page, 0, PAGE_SIZE);
@@ -65,8 +66,8 @@ static const char *nfs_get_link(struct dentry *dentry,
 		err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping));
 		if (err)
 			return err;
-		page = read_cache_page(&inode->i_data, 0,
-					(filler_t *)nfs_symlink_filler, inode);
+		page = read_cache_page(&inode->i_data, 0, nfs_symlink_filler,
+				inode);
 		if (IS_ERR(page))
 			return ERR_CAST(page);
 	}
-- 
2.20.1