Re: missing kfree in fs/ext3/balloc.c

From: randy_dunlap
Date: Fri Jun 17 2005 - 22:23:53 EST

On Fri, 17 Jun 2005 19:53:12 -0700 (PDT) movq movq wrote:

| This is my first post, so be kind. Perhaps I am wrong
| here, but I was looking through fs/ext3/balloc.c and
| noticed this line:
| line 268
| ...
| block_i = kmalloc(sizeof(*block_i), GFP_NOFS);
| ...
| But I do not see this chunk of memory ever kfree()'d.
| Is there a reason for this or is this kfree() just
| missing?

It's not supposed to be freed in that function.
It is saved for later use at line 288:

ei->i_block_alloc_info = block_i;

and freed (I think) in fs/ext3/super.c::ext3_clear_inode():

EXT3_I(inode)->i_block_alloc_info = NULL;

where rsv is:
struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;

However, back to fs/ext3/balloc.c::ext3_init_block_alloc_info():

struct ext3_inode_info *ei = EXT3_I(inode);
[1] struct ext3_block_alloc_info *block_i = ei->i_block_alloc_info;
struct super_block *sb = inode->i_sb;

[2] block_i = kmalloc(sizeof(*block_i), GFP_NOFS);
if (block_i) {

Seems to me that <block_i> [1] is clobbered by [2] and could be a
memory leak unless the value in [1] is always NULL....

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