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Subject: Re: [Intel-wired-lan] [PATCH] ice: Fix possible double free in error handling path X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: przemyslaw.kitszel@intel.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org, edumazet@google.com, netdev@vger.kernel.org, anthony.l.nguyen@intel.com, david.m.ertman@intel.com, kuba@kernel.org, pabeni@redhat.com, shiraz.saleem@intel.com, davem@davemloft.net, intel-wired-lan@lists.osuosl.org Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" From: Ma Ke Date: Fri, 30 Aug 2024 21:33:24 +0800 > When auxiliary_device_add() returns error and then calls > auxiliary_device_uninit(), callback function adev_release > calls kfree(iadev). We shouldn't call kfree(iadev) again > in the error handling path. Set 'iadev' to NULL. > > Cc: stable@vger.kernel.org You need to add a comment with the first kernel version which has this bug. E.g. Cc: stable@vger.kernel.org # 9.9+ (replace 9.9 with the actual version) BTW usually Cc: stable goes *after* "Fixes:". > Fixes: f9f5301e7e2d ("ice: Register auxiliary device to provide RDMA") > Signed-off-by: Ma Ke > --- > drivers/net/ethernet/intel/ice/ice_idc.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/net/ethernet/intel/ice/ice_idc.c b/drivers/net/ethernet/intel/ice/ice_idc.c > index 145b27f2a4ce..5db05f54a80c 100644 > --- a/drivers/net/ethernet/intel/ice/ice_idc.c > +++ b/drivers/net/ethernet/intel/ice/ice_idc.c > @@ -330,6 +330,7 @@ int ice_plug_aux_dev(struct ice_pf *pf) > return ret; > } > > + iadev = NULL; > ret = auxiliary_device_add(adev); > if (ret) { > auxiliary_device_uninit(adev); I don't understand this patch. I checked net-next, tnguy/net-queue, tnguy/next-queue and not in a single branch @iadev is used after auxiliary_device_add(). IOW you just introduce a dead store which will be removed by the compiler. The kfree() above that you mentioned is called only once and never after auxiliary_device_uninit(). Can you draw a call ladder with the related code pieces how I can reproduce the issue? Thanks, Olek