[PATCH] hostfs: Fix the NULL vs IS_ERR() bug for __filemap_get_folio()

[Peng Zhang]

From: ZhangPeng <zhangpeng...@huawei.com>

The __filemap_get_folio() function returns error pointers.
It never returns NULL. So use IS_ERR() to check it.

Fixes: 1da86618bdce ("fs: Convert aops->write_begin to take a folio")
Signed-off-by: ZhangPeng <zhangpeng...@huawei.com>
---
 fs/hostfs/hostfs_kern.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 6d1cf2436ead..084f6ed2dd7a 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -471,8 +471,8 @@ static int hostfs_write_begin(struct file *file, struct 
address_space *mapping,
 
        *foliop = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN,
                        mapping_gfp_mask(mapping));
-       if (!*foliop)
-               return -ENOMEM;
+       if (IS_ERR(*foliop))
+               return PTR_ERR(*foliop);
        return 0;
 }
 
-- 
2.25.1