The patch titled
Subject: ocfs2: fix NULL dereference for moving extents
has been added to the -mm tree. Its filename is
ocfs2-fix-null-dereference-for-moving-extents.patch
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From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Subject: ocfs2: fix NULL dereference for moving extents
We can't dereference "bg" before it has been assigned. GCC should have
warned about this but "bg" was initialized to NULL. I've fixed that as
well.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx>
Reviewed-by: Jie Liu <jeff.liu@xxxxxxxxxx>
Cc: Mark Fasheh <mfasheh@xxxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/move_extents.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff -puN fs/ocfs2/move_extents.c~ocfs2-fix-null-dereference-for-moving-extents fs/ocfs2/move_extents.c
--- a/fs/ocfs2/move_extents.c~ocfs2-fix-null-dereference-for-moving-extents
+++ a/fs/ocfs2/move_extents.c
@@ -471,7 +471,7 @@ static int ocfs2_validate_and_adjust_mov
int ret, goal_bit = 0;
struct buffer_head *gd_bh = NULL;
- struct ocfs2_group_desc *bg = NULL;
+ struct ocfs2_group_desc *bg;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
int c_to_b = 1 << (osb->s_clustersize_bits -
inode->i_sb->s_blocksize_bits);
@@ -482,13 +482,6 @@ static int ocfs2_validate_and_adjust_mov
range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
range->me_goal);
/*
- * moving goal is not allowd to start with a group desc blok(#0 blk)
- * let's compromise to the latter cluster.
- */
- if (range->me_goal == le64_to_cpu(bg->bg_blkno))
- range->me_goal += c_to_b;
-
- /*
* validate goal sits within global_bitmap, and return the victim
* group desc
*/
@@ -502,6 +495,13 @@ static int ocfs2_validate_and_adjust_mov
bg = (struct ocfs2_group_desc *)gd_bh->b_data;
/*
+ * moving goal is not allowd to start with a group desc blok(#0 blk)
+ * let's compromise to the latter cluster.
+ */
+ if (range->me_goal == le64_to_cpu(bg->bg_blkno))
+ range->me_goal += c_to_b;
+
+ /*
* movement is not gonna cross two groups.
*/
if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize <
_
Patches currently in -mm which might be from dan.carpenter@xxxxxxxxxx are
linux-next.patch
ocfs2-fix-error-handling-in-ocfs2_ioctl_move_extents.patch
ocfs2-fix-null-dereference-for-moving-extents.patch
mm-page_alloc-avoid-marking-zones-full-prematurely-after-zone_reclaim-fix.patch
i2o-check-copy_from_user-size-parameter.patch
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