lkml.org 
[lkml]   [2023]   [Feb]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] ksmbd: fix possible memory leak in smb2_lock()
From
On 4/2/2023 18:10, Namjae Jeon wrote:
> 2023-02-01 17:10 GMT+09:00, Hangyu Hua <hbh25y@gmail.com>:
>> argv needs to be free when setup_async_work fails or when the current
>> process is woken up.
>>
>> Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3")
>> Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
>> ---
>> fs/ksmbd/smb2pdu.c | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
>> index d681f91947d9..5b7668c04f76 100644
>> --- a/fs/ksmbd/smb2pdu.c
>> +++ b/fs/ksmbd/smb2pdu.c
>> @@ -7050,6 +7050,7 @@ int smb2_lock(struct ksmbd_work *work)
>> smb2_remove_blocked_lock,
>> argv);
>> if (rc) {
>> + kfree(argv);
>> err = -ENOMEM;
>> goto out;
>> }
>> @@ -7061,6 +7062,8 @@ int smb2_lock(struct ksmbd_work *work)
>>
>> ksmbd_vfs_posix_lock_wait(flock);
>>
>> + work->cancel_fn = NULL;
>> + kfree(argv);
> This change seems to causes a NULL pointer dereference issue in
> set_close_state_blocked_works(). It is right to free it and set NULL
> after removing entry from list.

I get it. I will send a v2.

Thanks,
Hangyu
>> if (work->state != KSMBD_WORK_ACTIVE) {
>> list_del(&smb_lock->llist);
>> spin_lock(&work->conn->llist_lock);
>> --
>> 2.34.1
>>
>>

\
 
 \ /
  Last update: 2023-03-27 00:10    [W:0.066 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site