[PATCH] ext4: ext4_mb_initialize_context() forgets to initialize some fields

[Pavel Roskin <proski@gnu.org>]

kmemcheck indicates that ext4_mb_store_histroy() accesses uninitialized
values of ac->ac_tail and ac->ac_buddy.

Signed-off-by: Pavel Roskin <proski@gnu.org>
---
 fs/ext4/mballoc.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 519a0a6..a5a9a35 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4223,6 +4223,8 @@ ext4_mb_initialize_context(struct ext4_allocation_context *ac,
 	ac->ac_groups_scanned = 0;
 	ac->ac_ex_scanned = 0;
 	ac->ac_found = 0;
+	ac->ac_tail = 0;
+	ac->ac_buddy = 0;
 	ac->ac_sb = sb;
 	ac->ac_inode = ar->inode;
 	ac->ac_o_ex.fe_logical = ar->logical;