linux-kernel - Re: [PATCH] nfsd/nfs4acl: Number of used used array elements needs to be zeroed.

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Date:	Thu, 04 Sep 2008 19:40:48 +0300
From:	Benny Halevy <bhalevy@...asas.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
CC:	Jiri Pirko <jpirko@...hat.com>, linux-kernel@...r.kernel.org,
	linux-nfs@...r.kernel.org, neilb@...e.de
Subject: Re: [PATCH] nfsd/nfs4acl: Number of used used array elements needs
 to be zeroed.

On Sep. 04, 2008, 18:01 +0300, "J. Bruce Fields" <bfields@...ldses.org> wrote:
> On Thu, Sep 04, 2008 at 04:55:18PM +0200, Jiri Pirko wrote:
>> Number of used used array elements needs to be zeroed. It may cause
>> problems otherwise, because it's used uninitialized in find_uid().
>>
>> Signed-off-by: Jiri Pirko <jpirko@...hat.com>
>> ---
>>  fs/nfsd/nfs4acl.c |    2 ++
>>  1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
>> index 54b8b41..7dcd90f 100644
>> --- a/fs/nfsd/nfs4acl.c
>> +++ b/fs/nfsd/nfs4acl.c
>> @@ -447,11 +447,13 @@ init_state(struct posix_acl_state *state, int cnt)
>>  	state->users = kzalloc(alloc, GFP_KERNEL);
>>  	if (!state->users)
>>  		return -ENOMEM;
>> +	state->users->n = 0;
>>  	state->groups = kzalloc(alloc, GFP_KERNEL);
>>  	if (!state->groups) {
>>  		kfree(state->users);
>>  		return -ENOMEM;
>>  	}
>> +	state->groups->n = 0;
>>  	return 0;
>>  }
> 
> Thanks for the extra eyes on this code, but: surely the kzalloc()'s are
> all that's necessary?  Am I missing something?

quickly browsing over the code, shouldn't it be:

diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
index b6ed383..54b8b41 100644
--- a/fs/nfsd/nfs4acl.c
+++ b/fs/nfsd/nfs4acl.c
@@ -443,7 +443,7 @@ init_state(struct posix_acl_state *state, int cnt)
 	 * enough space for either:
 	 */
 	alloc = sizeof(struct posix_ace_state_array)
-		+ cnt*sizeof(struct posix_ace_state);
+		+ cnt*sizeof(struct posix_user_ace_state);
 	state->users = kzalloc(alloc, GFP_KERNEL);
 	if (!state->users)
 		return -ENOMEM;

Benny

> 
> --b.
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