From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 802F759B76 for ; Tue, 5 Mar 2024 13:17:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709644629; cv=none; b=tNJ3if8wqxxKlIE40UevkMTtkvOmvhs+8D34Qv8A+AKHl4vRvhhFhUxhKFDFi1S77iP6FP1OULvK/HT/LVFq03J8VK/2JzI7zUABQZFbqFcsOFVf1KQlNxybAy25P6ECMsVBAi8gdHZaeEGrW3E91mYbhT00ai8F/Jd9g9KM9Ig= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709644629; c=relaxed/simple; bh=Afd4CESzX64lLwTm+lUvri9E644vZeX1CCKpS8xPEF4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=U1hP7anOOUhklDo4VtL06p75EHXWJnDOigYLS+NvVCC21XdOLzppDuDQRrVtpOhzgcjR/f+lpN05khJYdpnKn9itGquo84MXdmwkQcl3P39dYW3n0bRsXo/Npn53HKlDC7EIeR2EaDrbqCOKYHXlh+gV1SA6yrXwqjMS+tcf0Lo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RRUUlcGm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="RRUUlcGm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1CB2C433F1; Tue, 5 Mar 2024 13:17:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1709644629; bh=Afd4CESzX64lLwTm+lUvri9E644vZeX1CCKpS8xPEF4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=RRUUlcGmb168v4WyLzbcWG1MhrL5wqK4Yx24qoszeOafcHFVl0miNEQt6zaOtV1y/ uoZ5JHSKU2gB5BYGZ2IbFBKc+U0jyUMQXMyYeVsT5yAe4vD/30sWb/EHUOOPQ3nz90 oTs7aYmjsQJuiEg7/+34Ri9ROi55IoOcqfq2VydLvzcMIg78+s6LxuIS5MKxdOKkDh k/fiZf6alwwPNMBFRq7TMOlELTBvcHXDu2qnzleEy1vbHZ1cNmB+OHmOa5wQL+lf2v DaEjIAzf2VWx1v5GLYleSXHT47112nnx7v/3qZkOVdX5cQPWisFNZ7gsjmCo5P9cY9 hfx5xY1sqM5mQ== Date: Tue, 5 Mar 2024 13:17:04 +0000 From: Simon Horman To: Jesse Brandeburg Cc: intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, Robert Elliott , Tony Nguyen , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Przemek Kitszel , Michal Swiatkowski Subject: Re: [PATCH iwl-net v1] ice: fix bug with suspend and rebuild Message-ID: <20240305131704.GD2357@kernel.org> References: <20240304230845.14934-1-jesse.brandeburg@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240304230845.14934-1-jesse.brandeburg@intel.com> On Mon, Mar 04, 2024 at 03:08:44PM -0800, Jesse Brandeburg wrote: > The ice driver would previously panic during suspend. This is caused > from the driver *only* calling the ice_vsi_free_q_vectors() function by > itself, when it is suspending. Since commit b3e7b3a6ee92 ("ice: prevent > NULL pointer deref during reload") the driver has zeroed out > num_q_vectors, and only restored it in ice_vsi_cfg_def(). > > This further causes the ice_rebuild() function to allocate a zero length > buffer, after which num_q_vectors is updated, and then the new value of > num_q_vectors is used to index into the zero length buffer, which > corrupts memory. > > The fix entails making sure all the code referencing num_q_vectors only > does so after it has been reset via ice_vsi_cfg_def(). > > I didn't perform a full bisect, but I was able to test against 6.1.77 > kernel and that ice driver works fine for suspend/resume with no panic, > so sometime since then, this problem was introduced. > > Also clean up an un-needed init of a local variable in the function > being modified. > > PANIC from 6.8.0-rc1: > > [1026674.915596] PM: suspend exit > [1026675.664697] ice 0000:17:00.1: PTP reset successful > [1026675.664707] ice 0000:17:00.1: 2755 msecs passed between update to cached PHC time > [1026675.667660] ice 0000:b1:00.0: PTP reset successful > [1026675.675944] ice 0000:b1:00.0: 2832 msecs passed between update to cached PHC time > [1026677.137733] ixgbe 0000:31:00.0 ens787: NIC Link is Up 1 Gbps, Flow Control: None > [1026677.190201] BUG: kernel NULL pointer dereference, address: 0000000000000010 > [1026677.192753] ice 0000:17:00.0: PTP reset successful > [1026677.192764] ice 0000:17:00.0: 4548 msecs passed between update to cached PHC time > [1026677.197928] #PF: supervisor read access in kernel mode > [1026677.197933] #PF: error_code(0x0000) - not-present page > [1026677.197937] PGD 1557a7067 P4D 0 > [1026677.212133] ice 0000:b1:00.1: PTP reset successful > [1026677.212143] ice 0000:b1:00.1: 4344 msecs passed between update to cached PHC time > [1026677.212575] > [1026677.243142] Oops: 0000 [#1] PREEMPT SMP NOPTI > [1026677.247918] CPU: 23 PID: 42790 Comm: kworker/23:0 Kdump: loaded Tainted: G W 6.8.0-rc1+ #1 > [1026677.257989] Hardware name: Intel Corporation M50CYP2SBSTD/M50CYP2SBSTD, BIOS SE5C620.86B.01.01.0005.2202160810 02/16/2022 > [1026677.269367] Workqueue: ice ice_service_task [ice] > [1026677.274592] RIP: 0010:ice_vsi_rebuild_set_coalesce+0x130/0x1e0 [ice] > [1026677.281421] Code: 0f 84 3a ff ff ff 41 0f b7 74 ec 02 66 89 b0 22 02 00 00 81 e6 ff 1f 00 00 e8 ec fd ff ff e9 35 ff ff ff 48 8b 43 30 49 63 ed <41> 0f b7 34 24 41 83 c5 01 48 8b 3c e8 66 89 b7 aa 02 00 00 81 e6 > [1026677.300877] RSP: 0018:ff3be62a6399bcc0 EFLAGS: 00010202 > [1026677.306556] RAX: ff28691e28980828 RBX: ff28691e41099828 RCX: 0000000000188000 > [1026677.314148] RDX: 0000000000000000 RSI: 0000000000000010 RDI: ff28691e41099828 > [1026677.321730] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > [1026677.329311] R10: 0000000000000007 R11: ffffffffffffffc0 R12: 0000000000000010 > [1026677.336896] R13: 0000000000000000 R14: 0000000000000000 R15: ff28691e0eaa81a0 > [1026677.344472] FS: 0000000000000000(0000) GS:ff28693cbffc0000(0000) knlGS:0000000000000000 > [1026677.353000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [1026677.359195] CR2: 0000000000000010 CR3: 0000000128df4001 CR4: 0000000000771ef0 > [1026677.366779] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [1026677.374369] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [1026677.381952] PKRU: 55555554 > [1026677.385116] Call Trace: > [1026677.388023] > [1026677.390589] ? __die+0x20/0x70 > [1026677.394105] ? page_fault_oops+0x82/0x160 > [1026677.398576] ? do_user_addr_fault+0x65/0x6a0 > [1026677.403307] ? exc_page_fault+0x6a/0x150 > [1026677.407694] ? asm_exc_page_fault+0x22/0x30 > [1026677.412349] ? ice_vsi_rebuild_set_coalesce+0x130/0x1e0 [ice] > [1026677.418614] ice_vsi_rebuild+0x34b/0x3c0 [ice] > [1026677.423583] ice_vsi_rebuild_by_type+0x76/0x180 [ice] > [1026677.429147] ice_rebuild+0x18b/0x520 [ice] > [1026677.433746] ? delay_tsc+0x8f/0xc0 > [1026677.437630] ice_do_reset+0xa3/0x190 [ice] > [1026677.442231] ice_service_task+0x26/0x440 [ice] > [1026677.447180] process_one_work+0x174/0x340 > [1026677.451669] worker_thread+0x27e/0x390 > [1026677.455890] ? __pfx_worker_thread+0x10/0x10 > [1026677.460627] kthread+0xee/0x120 > [1026677.464235] ? __pfx_kthread+0x10/0x10 > [1026677.468445] ret_from_fork+0x2d/0x50 > [1026677.472476] ? __pfx_kthread+0x10/0x10 > [1026677.476671] ret_from_fork_asm+0x1b/0x30 > [1026677.481050] > > Fixes: b3e7b3a6ee92 ("ice: prevent NULL pointer deref during reload") > Reported-by: Robert Elliott > Signed-off-by: Jesse Brandeburg > --- > drivers/net/ethernet/intel/ice/ice_lib.c | 16 ++++++++-------- > 1 file changed, 8 insertions(+), 8 deletions(-) > > diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c > index 097bf8fd6bf0..0f5a92a6b1e6 100644 > --- a/drivers/net/ethernet/intel/ice/ice_lib.c > +++ b/drivers/net/ethernet/intel/ice/ice_lib.c > @@ -3238,7 +3238,7 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, u32 vsi_flags) > { > struct ice_vsi_cfg_params params = {}; > struct ice_coalesce_stored *coalesce; > - int prev_num_q_vectors = 0; > + int prev_num_q_vectors; > struct ice_pf *pf; > int ret; > > @@ -3252,13 +3252,6 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, u32 vsi_flags) > if (WARN_ON(vsi->type == ICE_VSI_VF && !vsi->vf)) > return -EINVAL; > > - coalesce = kcalloc(vsi->num_q_vectors, > - sizeof(struct ice_coalesce_stored), GFP_KERNEL); > - if (!coalesce) > - return -ENOMEM; > - > - prev_num_q_vectors = ice_vsi_rebuild_get_coalesce(vsi, coalesce); > - > ret = ice_vsi_realloc_stat_arrays(vsi); > if (ret) > goto err_vsi_cfg; > @@ -3268,6 +3261,13 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, u32 vsi_flags) > if (ret) > goto err_vsi_cfg; Hi Jesse, the label above will result in a call to kfree(coalesce). However, coalesce is now uninitialised until the following line executes. > > + coalesce = kcalloc(vsi->num_q_vectors, > + sizeof(struct ice_coalesce_stored), GFP_KERNEL); > + if (!coalesce) > + return -ENOMEM; > + > + prev_num_q_vectors = ice_vsi_rebuild_get_coalesce(vsi, coalesce); > + > ret = ice_vsi_cfg_tc_lan(pf, vsi); > if (ret) { > if (vsi_flags & ICE_VSI_FLAG_INIT) { > > base-commit: 6923134fc6b62d7909169b3ad913ab72ee04233a -- pw-bot: changes-requested