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iwlwifi: mvm: properly check for transport data in dump

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When copying from vmalloc'ed memory to the SG list, don't crash
if the transport didn't provide any data.

Fixes: 7e62a699aa ("iwlwifi: mvm: use dev_coredumpsg()")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Johannes Berg 2016-10-20 15:25:00 +02:00 committed by Luca Coelho
parent 5bdaa0ef77
commit c2e27e16f2
1 changed files with 6 additions and 5 deletions
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11
drivers/net/wireless/intel/iwlwifi/mvm/fw-dbg.c
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@ -848,11 +848,12 @@ void iwl_mvm_fw_error_dump(struct iwl_mvm *mvm)
sg_nents(sg_dump_data),
fw_error_dump->op_mode_ptr,
fw_error_dump->op_mode_len, 0);
sg_pcopy_from_buffer(sg_dump_data,
sg_nents(sg_dump_data),
fw_error_dump->trans_ptr->data,
fw_error_dump->trans_ptr->len,
fw_error_dump->op_mode_len);
if (fw_error_dump->trans_ptr)
sg_pcopy_from_buffer(sg_dump_data,
sg_nents(sg_dump_data),
fw_error_dump->trans_ptr->data,
fw_error_dump->trans_ptr->len,
fw_error_dump->op_mode_len);
dev_coredumpsg(mvm->trans->dev, sg_dump_data, file_len,
GFP_KERNEL);
}