From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Wed, 6 May 2015 03:20:29 +0000 (-0700)
Subject: f2fs crypto: fix missing key when reading a page
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=edf3fb8e9e5771944815fadbd8ef6a7e43ef0f7c;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

f2fs crypto: fix missing key when reading a page

1. mount $mnt
2. cp data $mnt/
3. umount $mnt
4. log out
5. log in
6. cat $mnt/data

-> panic, due to no i_crypt_info.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/crypto.c b/fs/f2fs/crypto.c
index c910fa722e5c..c3f02b61aa5a 100644
--- a/fs/f2fs/crypto.c
+++ b/fs/f2fs/crypto.c
@@ -131,7 +131,9 @@ struct f2fs_crypto_ctx *f2fs_get_crypto_ctx(struct inode *inode)
 	unsigned long flags;
 	struct f2fs_crypt_info *ci = F2FS_I(inode)->i_crypt_info;
 
-	BUG_ON(ci == NULL);
+	if (ci == NULL)
+		return ERR_PTR(-EACCES);
+
 	/*
 	 * We first try getting the ctx from a free list because in
 	 * the common case the ctx will have an allocated and