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iwmc3200wifi: using freed memory in iwm_hal_send_target_cmd()

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Hello,

I found this with a source code checker (http://repo.or.cz/w/smatch.git).

We free "cmd" on line 390 and then dereference it on line 396.  I don't 
know what we should return in that case or I would have sent a patch.  
Sorry.

drivers/net/wireless/iwmc3200wifi/hal.c
   390          if (!udma_cmd->resp)
   391                  kfree(cmd);
   392  
   393          if (ret < 0)
   394                  return ret;
   395  
   396          return cmd->seq_num;

regards,
dan carpenter
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