ath9k: fix buffer overrun for ar9287

commit 83d6f1f15f8cce844b0a131cbc63e444620e48b5 upstream.

Code that was added back in 2.6.38 has an obvious overflow
when accessing a static array, and at the time it was added
only a code comment was put in front of it as a reminder
to have it reviewed properly.

This has not happened, but gcc-6 now points to the specific
overflow:

drivers/net/wireless/ath/ath9k/eeprom.c: In function 'ath9k_hw_get_gain_boundaries_pdadcs':
drivers/net/wireless/ath/ath9k/eeprom.c:483:44: error: array subscript is above array bounds [-Werror=array-bounds]
     maxPwrT4[i] = data_9287[idxL].pwrPdg[i][4];
                   ~~~~~~~~~~~~~~~~~~~~~~~~~^~~

It turns out that the correct array length exists in the local
'intercepts' variable of this function, so we can just use that
instead of hardcoding '4', so this patch changes all three
instances to use that variable. The other two instances were
already correct, but it's more consistent this way.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 940cd2c12ebf ("ath9k_hw: merge the ar9287 version of ath9k_hw_get_gain_boundaries_pdadcs")
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/wireless/ath/ath9k/eeprom.c b/drivers/net/wireless/ath/ath9k/eeprom.c
index e46f751ab50818d1c30d31a6f271c67409192eef..b62f08cf5b8c1928afa882abe8d2b5b64c6480f6 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/eeprom.c
@@ -364,10 +364,9 @@ void ath9k_hw_get_gain_boundaries_pdadcs(struct ath_hw *ah,
 
        if (match) {
                if (AR_SREV_9287(ah)) {
-                       /* FIXME: array overrun? */
                        for (i = 0; i < numXpdGains; i++) {
                                minPwrT4[i] = data_9287[idxL].pwrPdg[i][0];
-                               maxPwrT4[i] = data_9287[idxL].pwrPdg[i][4];
+                               maxPwrT4[i] = data_9287[idxL].pwrPdg[i][intercepts - 1];
                                ath9k_hw_fill_vpd_table(minPwrT4[i], maxPwrT4[i],
                                                data_9287[idxL].pwrPdg[i],
                                                data_9287[idxL].vpdPdg[i],
@@ -377,7 +376,7 @@ void ath9k_hw_get_gain_boundaries_pdadcs(struct ath_hw *ah,
                } else if (eeprom_4k) {
                        for (i = 0; i < numXpdGains; i++) {
                                minPwrT4[i] = data_4k[idxL].pwrPdg[i][0];
-                               maxPwrT4[i] = data_4k[idxL].pwrPdg[i][4];
+                               maxPwrT4[i] = data_4k[idxL].pwrPdg[i][intercepts - 1];
                                ath9k_hw_fill_vpd_table(minPwrT4[i], maxPwrT4[i],
                                                data_4k[idxL].pwrPdg[i],
                                                data_4k[idxL].vpdPdg[i],
@@ -387,7 +386,7 @@ void ath9k_hw_get_gain_boundaries_pdadcs(struct ath_hw *ah,
                } else {
                        for (i = 0; i < numXpdGains; i++) {
                                minPwrT4[i] = data_def[idxL].pwrPdg[i][0];
-                               maxPwrT4[i] = data_def[idxL].pwrPdg[i][4];
+                               maxPwrT4[i] = data_def[idxL].pwrPdg[i][intercepts - 1];
                                ath9k_hw_fill_vpd_table(minPwrT4[i], maxPwrT4[i],
                                                data_def[idxL].pwrPdg[i],
                                                data_def[idxL].vpdPdg[i],