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iwlagn: fix panic in iwl{5000,4965}_rx_reply_tx 

In some cases firmware can give us bad value of index in transmit
buffers array. This patch add sanity check for such values and return
from processing function instantly when it happens.

https://bugzilla.redhat.com/show_bug.cgi?id=521931

Patch was tested by reporter on iwl5000. I think check can be also
helpful for 4965.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka 2009-09-23 10:51:34 +02:00 committed by John W. Linville
parent e31f7b96f0
commit 6c6a22e268
2 changed files with 12 additions and 0 deletions
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6
drivers/net/wireless/iwlwifi/iwl-4965.c
View File

@ -2021,6 +2021,12 @@ static int iwl4965_tx_status_reply_tx(struct iwl_priv *priv,
agg->frame_count, txq_id, idx);
hdr = iwl_tx_queue_get_hdr(priv, txq_id, idx);
if (!hdr) {
IWL_ERR(priv,
"BUG_ON idx doesn't point to valid skb"
" idx=%d, txq_id=%d\n", idx, txq_id);
return -1;
}
sc = le16_to_cpu(hdr->seq_ctrl);
if (idx != (SEQ_TO_SN(sc) & 0xff)) {

6
drivers/net/wireless/iwlwifi/iwl-5000.c
View File

@ -1163,6 +1163,12 @@ static int iwl5000_tx_status_reply_tx(struct iwl_priv *priv,
agg->frame_count, txq_id, idx);
hdr = iwl_tx_queue_get_hdr(priv, txq_id, idx);
if (!hdr) {
IWL_ERR(priv,
"BUG_ON idx doesn't point to valid skb"
" idx=%d, txq_id=%d\n", idx, txq_id);
return -1;
}
sc = le16_to_cpu(hdr->seq_ctrl);
if (idx != (SEQ_TO_SN(sc) & 0xff)) {