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p54: potential signedness issue in p54_parse_rssical()

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"entries" is unsigned here, so it is never less than zero.  In theory,
len could be less than offset so I have added a check for that.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Dan Carpenter 2012-12-02 13:36:09 +03:00 committed by John W. Linville
parent 06ef5c4bbb
commit 6dac344742
1 changed files with 3 additions and 2 deletions
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5
drivers/net/wireless/p54/eeprom.c
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@ -541,8 +541,9 @@ static int p54_parse_rssical(struct ieee80211_hw *dev,
entries = (len - offset) /
sizeof(struct pda_rssi_cal_ext_entry);
if ((len - offset) % sizeof(struct pda_rssi_cal_ext_entry) ||
entries <= 0) {
if (len < offset ||
(len - offset) % sizeof(struct pda_rssi_cal_ext_entry) ||
entries == 0) {
wiphy_err(dev->wiphy, "invalid rssi database.\n");
goto err_data;
}