From: Theodore Ts'o <tytso@mit.edu>
Date: Sun, 31 May 2015 17:35:39 +0000 (-0400)
Subject: ext4 crypto: handle unexpected lack of encryption keys
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~122^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=abdd438b26b409eaccf9c847fcf9c3ab52f1959e;p=pandora-kernel.git

ext4 crypto: handle unexpected lack of encryption keys

Fix up attempts by users to try to write to a file when they don't
have access to the encryption key.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
index 1c9a8c499369..efcb7c04d172 100644
--- a/fs/ext4/crypto.c
+++ b/fs/ext4/crypto.c
@@ -104,7 +104,8 @@ struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode)
 	unsigned long flags;
 	struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
 
-	BUG_ON(ci == NULL);
+	if (ci == NULL)
+		return ERR_PTR(-ENOKEY);
 
 	/*
 	 * We first try getting the ctx from a free list because in
diff --git a/fs/ext4/crypto_policy.c b/fs/ext4/crypto_policy.c
index a1d434d0dea8..02c4e5df7afb 100644
--- a/fs/ext4/crypto_policy.c
+++ b/fs/ext4/crypto_policy.c
@@ -183,7 +183,8 @@ int ext4_inherit_context(struct inode *parent, struct inode *child)
 	if (res < 0)
 		return res;
 	ci = EXT4_I(parent)->i_crypt_info;
-	BUG_ON(ci == NULL);
+	if (ci == NULL)
+		return -ENOKEY;
 
 	ctx.format = EXT4_ENCRYPTION_CONTEXT_FORMAT_V1;
 	if (DUMMY_ENCRYPTION_ENABLED(EXT4_SB(parent->i_sb))) {
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