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Message-Id: <20190719041304.18849-43-sashal@kernel.org>
Date: Fri, 19 Jul 2019 00:13:02 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Christoph Hellwig <hch@....de>, Kees Cook <keescook@...omium.org>,
Sami Tolvanen <samitolvanen@...gle.com>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Sasha Levin <sashal@...nel.org>,
v9fs-developer@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 4.9 43/45] 9p: pass the correct prototype to read_cache_page
From: Christoph Hellwig <hch@....de>
[ Upstream commit f053cbd4366051d7eb6ba1b8d529d20f719c2963 ]
Fix the callback 9p 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.
Link: http://lkml.kernel.org/r/20190520055731.24538-5-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Kees Cook <keescook@...omium.org>
Cc: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
fs/9p/vfs_addr.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 6181ad79e1a5..e45b1a0dd513 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -49,8 +49,9 @@
* @page: structure to page
*
*/
-static int v9fs_fid_readpage(struct p9_fid *fid, struct page *page)
+static int v9fs_fid_readpage(void *data, struct page *page)
{
+ struct p9_fid *fid = data;
struct inode *inode = page->mapping->host;
struct bio_vec bvec = {.bv_page = page, .bv_len = PAGE_SIZE};
struct iov_iter to;
@@ -121,7 +122,8 @@ static int v9fs_vfs_readpages(struct file *filp, struct address_space *mapping,
if (ret == 0)
return ret;
- ret = read_cache_pages(mapping, pages, (void *)v9fs_vfs_readpage, filp);
+ ret = read_cache_pages(mapping, pages, v9fs_fid_readpage,
+ filp->private_data);
p9_debug(P9_DEBUG_VFS, " = %d\n", ret);
return ret;
}
--
2.20.1
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