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iwlwifi: Fix null pointer referencing in iwl_dbgfs_rx_queue_read. 

Test for null pointer prior to access.
Print "Not Allocated" if null pointer.

Signed-off-by: Dor Shaish <dor.shaish@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
This commit is contained in:
Dor Shaish 2010-06-01 00:04:08 -07:00 committed by Reinette Chatre
parent f4989d9bef
commit f5cc6a224d
1 changed files with 6 additions and 1 deletions
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7
drivers/net/wireless/iwlwifi/iwl-debugfs.c
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@ -1018,8 +1018,13 @@ static ssize_t iwl_dbgfs_rx_queue_read(struct file *file,
rxq->write);
pos += scnprintf(buf + pos, bufsz - pos, "free_count: %u\n",
rxq->free_count);
pos += scnprintf(buf + pos, bufsz - pos, "closed_rb_num: %u\n",
if (rxq->rb_stts) {
pos += scnprintf(buf + pos, bufsz - pos, "closed_rb_num: %u\n",
le16_to_cpu(rxq->rb_stts->closed_rb_num) & 0x0FFF);
} else {
pos += scnprintf(buf + pos, bufsz - pos,
"closed_rb_num: Not Allocated\n");
}
return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
}