From: Wang Shilong <wangsl-fnst@xxxxxxxxxxxxxx>
Add a necessary check when an io error happens.
If io error happens,free the memory allocated and forget
buffer head.
Signed-off-by: Wang Shilong <wangsl-fnst@xxxxxxxxxxxxxx>
---
fs/ext2/inode.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 6363ac6..c3881e5 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -495,6 +495,10 @@ static int ext2_alloc_branch(struct inode *inode,
* parent to disk.
*/
bh = sb_getblk(inode->i_sb, new_blocks[n-1]);
+ if (unlikely(!bh)) {
+ err = -ENOMEM;
+ goto failed;
+ }
branch[n].bh = bh;
lock_buffer(bh);
memset(bh->b_data, 0, blocksize);
@@ -523,6 +527,14 @@ static int ext2_alloc_branch(struct inode *inode,
}
*blks = num;
return err;
+
+failed:
+ for (i = 1; i < n; i++)
+ bforget(branch[i].bh);
+ for (i = 0; i < indirect_blks; i++)
+ ext2_free_blocks(inode, new_blocks[i], 1);
+ ext2_free_blocks(inode, new_blocks[i], num);
+ return err;
}
/**
--
1.7.7.6
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