DivestOS/Patches/Linux_CVEs/CVE-2015-7509/0.patch

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From c9b92530a723ac5ef8e352885a1862b18f31b2f5 Mon Sep 17 00:00:00 2001
From: Anatol Pomozov <anatol.pomozov@gmail.com>
Date: Tue, 18 Sep 2012 13:38:59 -0400
Subject: ext4: make orphan functions be no-op in no-journal mode
Instead of checking whether the handle is valid, we check if journal
is enabled. This avoids taking the s_orphan_lock mutex in all cases
when there is no journal in use, including the error paths where
ext4_orphan_del() is called with a handle set to NULL.
Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
fs/ext4/namei.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 37c03b3..8f4bda7 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2369,7 +2369,7 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
struct ext4_iloc iloc;
int err = 0, rc;
- if (!ext4_handle_valid(handle))
+ if (!EXT4_SB(sb)->s_journal)
return 0;
mutex_lock(&EXT4_SB(sb)->s_orphan_lock);
@@ -2443,8 +2443,7 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
struct ext4_iloc iloc;
int err = 0;
- /* ext4_handle_valid() assumes a valid handle_t pointer */
- if (handle && !ext4_handle_valid(handle))
+ if (!EXT4_SB(inode->i_sb)->s_journal)
return 0;
mutex_lock(&EXT4_SB(inode->i_sb)->s_orphan_lock);
@@ -2463,7 +2462,7 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
* transaction handle with which to update the orphan list on
* disk, but we still need to remove the inode from the linked
* list in memory. */
- if (sbi->s_journal && !handle)
+ if (!handle)
goto out;
err = ext4_reserve_inode_write(handle, inode, &iloc);
--
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