From: Fabio M. De Francesco fmdefrancesco@gmail.com
commit c15a059f85de49c542e6ec2464967dd2b2aa18f6 upstream.
Use the GFP_ATOMIC flag of kzalloc() with two memory allocation in report_del_sta_event(). This function is called while holding spinlocks, therefore it is not allowed to sleep. With the GFP_ATOMIC type flag, the allocation is high priority and must not sleep.
This issue is detected by Smatch which emits the following warning: "drivers/staging/r8188eu/core/rtw_mlme_ext.c:6848 report_del_sta_event() warn: sleeping in atomic context".
After the change, the post-commit hook output the following message: "CHECK: Prefer kzalloc(sizeof(*pcmd_obj)...) over kzalloc(sizeof(struct cmd_obj)...)".
According to the above "CHECK", use the preferred style in the first kzalloc().
Fixes: 79f712ea994d ("staging: r8188eu: Remove wrappers for kalloc() and kzalloc()") Fixes: 15865124feed ("staging: r8188eu: introduce new core dir for RTL8188eu driver") Signed-off-by: Fabio M. De Francesco fmdefrancesco@gmail.com Link: https://lore.kernel.org/r/20211101191847.6749-1-fmdefrancesco@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: stable stable@vger.kernel.org --- drivers/staging/r8188eu/core/rtw_mlme_ext.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/staging/r8188eu/core/rtw_mlme_ext.c +++ b/drivers/staging/r8188eu/core/rtw_mlme_ext.c @@ -7080,12 +7080,12 @@ void report_del_sta_event(struct adapter struct mlme_ext_priv *pmlmeext = &padapter->mlmeextpriv; struct cmd_priv *pcmdpriv = &padapter->cmdpriv;
- pcmd_obj = kzalloc(sizeof(struct cmd_obj), GFP_KERNEL); + pcmd_obj = kzalloc(sizeof(*pcmd_obj), GFP_ATOMIC); if (!pcmd_obj) return;
cmdsz = (sizeof(struct stadel_event) + sizeof(struct C2HEvent_Header)); - pevtcmd = kzalloc(cmdsz, GFP_KERNEL); + pevtcmd = kzalloc(cmdsz, GFP_ATOMIC); if (!pevtcmd) { kfree(pcmd_obj); return;