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Message-ID: <f5c4d092-eeb7-2342-605f-7d86df9b1b10@gmail.com> Date: Mon, 8 Aug 2022 20:30:23 -0700 From: Florian Fainelli <f.fainelli@...il.com> To: Lin Ma <linma@....edu.cn>, jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, ast@...nel.org, daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com, intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org Subject: Re: [PATCH v1] idb: Add lock to avoid data race On 8/8/2022 7:59 PM, Lin Ma wrote: > The commit c23d92b80e0b ("igb: Teardown SR-IOV before > unregister_netdev()") places the unregister_netdev() call after the > igb_disable_sriov() call to avoid functionality issue. > > However, it introduces several race conditions when detaching a device. > For example, when .remove() is called, the below interleaving leads to > use-after-free. > > (FREE from device detaching) | (USE from netdev core) > igb_remove | igb_ndo_get_vf_config > igb_disable_sriov | vf >= adapter->vfs_allocated_count? > kfree(adapter->vf_data) | > adapter->vfs_allocated_count = 0 | > | memcpy(... adapter->vf_data[vf] > > Moreover, just as commit 1e53834ce541 ("ixgbe: Add locking to > prevent panic when setting sriov_numvfs to zero") shows. The > igb_disable_sriov function also need to watch out the requests from VF > driver. > > To this end, this commit first eliminates the data races from netdev > core by using rtnl_lock (similar to commit 719479230893 ("dpaa2-eth: add > MAC/PHY support through phylink")). And then adds a spinlock just as > 1d53834ce541 did. > > Fixes: c23d92b80e0b ("igb: Teardown SR-IOV before unregister_netdev()") > Signed-off-by: Lin Ma <linma@....edu.cn> You have a typo in your subject: s/idb/igb/ -- Florian
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