On Wed, Mar 30, 2022 at 11:16:07PM +0800, xkernel.wang@xxxxxxxxxxx wrote:
> From: Xiaoke Wang <xkernel.wang@xxxxxxxxxxx>
>
> kzalloc() is a memory allocation function which can return NULL when
> some internal memory errors happen. So it is better to handle the return
> of it to prevent potential wrong memory access.
> For the kzalloc() in go_add_group_info_attr(), since there is a lack
> of error handlers along the call chain it lies and the lifetime of
> `pdata_attr` is only in go_add_group_info_attr(), `pdata_attr` is roughly
> changed to a local variable on stack like the other functions in
> rtw_p2p.c, such as `u8 p2pie[MAX_P2P_IE_LEN] = { 0x00 };` in
> issue_p2p_presence_resp().
>
> Signed-off-by: Xiaoke Wang <xkernel.wang@xxxxxxxxxxx>
> ---
> drivers/staging/r8188eu/core/rtw_p2p.c | 6 ++----
> drivers/staging/r8188eu/core/rtw_xmit.c | 12 +++++++++---
> drivers/staging/r8188eu/include/rtw_xmit.h | 2 +-
> 3 files changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/staging/r8188eu/core/rtw_p2p.c b/drivers/staging/r8188eu/core/rtw_p2p.c
> index e2b6cf2..f1a5df8 100644
> --- a/drivers/staging/r8188eu/core/rtw_p2p.c
> +++ b/drivers/staging/r8188eu/core/rtw_p2p.c
> @@ -27,15 +27,14 @@ static u32 go_add_group_info_attr(struct wifidirect_info *pwdinfo, u8 *pbuf)
> struct list_head *phead, *plist;
> u32 len = 0;
> u16 attr_len = 0;
> - u8 tmplen, *pdata_attr, *pstart, *pcur;
> + u8 pdata_attr[MAX_P2P_IE_LEN] = { 0x00 };
You just created a huge variable on the stack. Are you _SURE_ that is
ok?
Have you tested this change to make sure it works? If not, I can't take
it, sorry.
greg k-h
