On 8/26/24 11:49 AM, Zheng Qixing wrote:
>
> 在 2024/8/23 9:10, Damien Le Moal 写道:
>> On 8/22/24 12:30 PM, Zheng Qixing wrote:
>>> From: Zheng Qixing <zhengqixing@xxxxxxxxxx>
>>>
>>> In ata_host_alloc(), if ata_port_alloc(host) fails to allocate memory
>>> for a port, the allocated 'host' structure is not freed before returning
>>> from the function. This results in a potential memory leak.
>>>
>>> This patch adds a kfree(host) before the error handling code is executed
>>> to ensure that the 'host' structure is properly freed in case of an
>>> allocation failure.
>>>
>>> Signed-off-by: Zheng Qixing <zhengqixing@xxxxxxxxxx>
>> This needs a Fixes tag. So I added:
>>
>> Fixes: 2623c7a5f279 ("libata: add refcounting to ata_host")
>> Cc: stable@xxxxxxxxxxxxxxx>
>>
>> and applied to for-6.11-fixes. Thanks.
>
>
> Based on Niklas Cassel's suggestion, the commit message and the actual
> content of the patch do not match.
>
> It should state "if devres_alloc(ata_devres_release, 0, GFP_KERNEL)
> fails to allocate memory" instead of "if ata_port_alloc(host) fails to allocate
> memory for a port".
>
> Should I modify the commit message and submit a new version of the patch?
No need. I fixed it up. The commit message now is:
ata: libata: Fix memory leak for error path in ata_host_alloc()
In ata_host_alloc(), if devres_alloc() fails to allocate the device host
resource data pointer, the already allocated ata_host structure is not
freed before returning from the function. This results in a potential
memory leak.
Call kfree(host) before jumping to the error handling path to ensure
that the ata_host structure is properly freed if devres_alloc() fails.
>
>
> Zheng Qixing
>
>
>>> ---
>>> Changes in v2:
>>> - error path is wrong in v1
>>>
>>> drivers/ata/libata-core.c | 4 +++-
>>> 1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
>>> index e4023fc288ac..f27a18990c38 100644
>>> --- a/drivers/ata/libata-core.c
>>> +++ b/drivers/ata/libata-core.c
>>> @@ -5663,8 +5663,10 @@ struct ata_host *ata_host_alloc(struct device *dev,
>>> int n_ports)
>>> }
>>> dr = devres_alloc(ata_devres_release, 0, GFP_KERNEL);
>>> - if (!dr)
>>> + if (!dr) {
>>> + kfree(host);
>>> goto err_out;
>>> + }
>>> devres_add(dev, dr);
>>> dev_set_drvdata(dev, host);
>
>
--
Damien Le Moal
Western Digital Research
