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9p: pass the correct prototype to read_cache_page

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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/[email protected]
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Cc: Sami Tolvanen <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Hellwig 2019-07-11 20:55:26 -07:00 • committed by Linus Torvalds
commit f053cbd436
1 changed files with 4 additions and 2 deletions
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6
fs/9p/vfs_addr.c
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@ -35,8 +35,9 @@
* @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;
@ -107,7 +108,8 @@ 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;
}