This is a note to let you know that I've just added the patch titled
mt76: mt7915: fix potential overflow of eeprom page index
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mt76-mt7915-fix-potential-overflow-of-eeprom-page-in.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f901a725edefe2e3f018d290c579a29542d7a9bf
Author: Shayne Chen <shayne.chen@xxxxxxxxxxxx>
Date: Tue Jul 20 10:48:32 2021 +0800
mt76: mt7915: fix potential overflow of eeprom page index
[ Upstream commit 82a980f82a511ce74ab57eb9f692d02225eb32f4 ]
If total eeprom size is divisible by per-page size, the i in for loop
will exceed max page index, which happens in our newer chipset.
Fixes: 26f18380e6ca ("mt76: mt7915: add support for flash mode")
Signed-off-by: Bo Jiao <bo.jiao@xxxxxxxxxxxx>
Signed-off-by: Shayne Chen <shayne.chen@xxxxxxxxxxxx>
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index c08c7398f9b85..e7e396f58c92c 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -3391,20 +3391,20 @@ int mt7915_mcu_set_chan_info(struct mt7915_phy *phy, int cmd)
static int mt7915_mcu_set_eeprom_flash(struct mt7915_dev *dev)
{
-#define TOTAL_PAGE_MASK GENMASK(7, 5)
+#define MAX_PAGE_IDX_MASK GENMASK(7, 5)
#define PAGE_IDX_MASK GENMASK(4, 2)
#define PER_PAGE_SIZE 0x400
struct mt7915_mcu_eeprom req = { .buffer_mode = EE_MODE_BUFFER };
- u8 total = MT7915_EEPROM_SIZE / PER_PAGE_SIZE;
+ u8 total = DIV_ROUND_UP(MT7915_EEPROM_SIZE, PER_PAGE_SIZE);
u8 *eep = (u8 *)dev->mt76.eeprom.data;
int eep_len;
int i;
- for (i = 0; i <= total; i++, eep += eep_len) {
+ for (i = 0; i < total; i++, eep += eep_len) {
struct sk_buff *skb;
int ret;
- if (i == total)
+ if (i == total - 1 && !!(MT7915_EEPROM_SIZE % PER_PAGE_SIZE))
eep_len = MT7915_EEPROM_SIZE % PER_PAGE_SIZE;
else
eep_len = PER_PAGE_SIZE;
@@ -3414,7 +3414,7 @@ static int mt7915_mcu_set_eeprom_flash(struct mt7915_dev *dev)
if (!skb)
return -ENOMEM;
- req.format = FIELD_PREP(TOTAL_PAGE_MASK, total) |
+ req.format = FIELD_PREP(MAX_PAGE_IDX_MASK, total - 1) |
FIELD_PREP(PAGE_IDX_MASK, i) | EE_FORMAT_WHOLE;
req.len = cpu_to_le16(eep_len);
