From: Jason Hrycay <jhrycay@gmail.com>
Date: Fri, 31 May 2013 17:45:11 +0000 (-0500)
Subject: f2fs: handle errors from get_node_page calls
X-Git-Tag: accepted/tizen/common/20141203.182822~1999^2~21
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1e03e38b35b8e72d65fd5d931627bd6ff02926c1;p=platform%2Fkernel%2Flinux-arm64.git

f2fs: handle errors from get_node_page calls

Add check for error pointers returned from get_node_page in order to
avoid dereferencing a bad address on the next use.

Signed-off-by: Jason Hrycay <jason.hrycay@motorola.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
---

diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index 0b02dce..ae61f35 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -218,6 +218,8 @@ int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
 		return -ENODATA;
 
 	page = get_node_page(sbi, fi->i_xattr_nid);
+	if (IS_ERR(page))
+		return PTR_ERR(page);
 	base_addr = page_address(page);
 
 	list_for_each_xattr(entry, base_addr) {
@@ -268,6 +270,8 @@ ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
 		return 0;
 
 	page = get_node_page(sbi, fi->i_xattr_nid);
+	if (IS_ERR(page))
+		return PTR_ERR(page);
 	base_addr = page_address(page);
 
 	list_for_each_xattr(entry, base_addr) {