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iwlwifi: fix double free/complete in firmware loading
Linus reported that due to mac80211 failing to register the device (due to WoWLAN) his machine crashed etc. as we double-freed the vmalloc() firmware area. His patch to fix it was very similar to this one but I noticed that there's another bug in the area: we complete the completion before starting, so since we're running in a work struct context stop() could be called while in the middle of start() which will almost certainly lead to issues. Make a modification similar to his to avoid the double- free but also move the completion to another spot so it is only done after start() either finished or failed so that stop() can have a consistent state. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -861,13 +861,18 @@ static void iwl_ucode_callback(const struct firmware *ucode_raw, void *context)
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/* We have our copies now, allow OS release its copies */
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release_firmware(ucode_raw);
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complete(&drv->request_firmware_complete);
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drv->op_mode = iwl_dvm_ops.start(drv->trans, drv->cfg, &drv->fw);
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if (!drv->op_mode)
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goto out_free_fw;
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goto out_unbind;
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/*
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* Complete the firmware request last so that
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* a driver unbind (stop) doesn't run while we
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* are doing the start() above.
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*/
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complete(&drv->request_firmware_complete);
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return;
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try_again:
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