From: Shayne Chen <shayne.chen@mediatek.com> To: Felix Fietkau <nbd@nbd.name> Cc: linux-wireless <linux-wireless@vger.kernel.org>, Lorenzo Bianconi <lorenzo.bianconi@redhat.com>, Ryder Lee <ryder.lee@mediatek.com>, linux-mediatek <linux-mediatek@lists.infradead.org>, Shayne Chen <shayne.chen@mediatek.com>, Bo Jiao <bo.jiao@mediatek.com> Subject: [PATCH v2] mt76: mt7915: fix potential overflow of eeprom page index Date: Tue, 20 Jul 2021 10:48:32 +0800 [thread overview] Message-ID: <20210720024832.20265-1-shayne.chen@mediatek.com> (raw) 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@mediatek.com> Signed-off-by: Shayne Chen <shayne.chen@mediatek.com> Reported-by: kernel test robot <lkp@intel.com> --- v2: fix warning reported by kernel test robot drivers/net/wireless/mediatek/mt76/mt7915/mcu.c:3407:22: warning: use of logical '&&' with constant operand [-Wconstant-logical-operand] if (i == total - 1 && MT7915_EEPROM_SIZE % PER_PAGE_SIZE) ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ --- drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c index 91efa9b..69b6796 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c @@ -3392,20 +3392,20 @@ 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; @@ -3415,7 +3415,7 @@ 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); -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Shayne Chen <shayne.chen@mediatek.com> To: Felix Fietkau <nbd@nbd.name> Cc: linux-wireless <linux-wireless@vger.kernel.org>, Lorenzo Bianconi <lorenzo.bianconi@redhat.com>, Ryder Lee <ryder.lee@mediatek.com>, linux-mediatek <linux-mediatek@lists.infradead.org>, Shayne Chen <shayne.chen@mediatek.com>, Bo Jiao <bo.jiao@mediatek.com> Subject: [PATCH v2] mt76: mt7915: fix potential overflow of eeprom page index Date: Tue, 20 Jul 2021 10:48:32 +0800 [thread overview] Message-ID: <20210720024832.20265-1-shayne.chen@mediatek.com> (raw) 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@mediatek.com> Signed-off-by: Shayne Chen <shayne.chen@mediatek.com> Reported-by: kernel test robot <lkp@intel.com> --- v2: fix warning reported by kernel test robot drivers/net/wireless/mediatek/mt76/mt7915/mcu.c:3407:22: warning: use of logical '&&' with constant operand [-Wconstant-logical-operand] if (i == total - 1 && MT7915_EEPROM_SIZE % PER_PAGE_SIZE) ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ --- drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c index 91efa9b..69b6796 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c @@ -3392,20 +3392,20 @@ 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; @@ -3415,7 +3415,7 @@ 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); -- 2.25.1 _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek
next reply other threads:[~2021-07-20 2:52 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-20 2:48 Shayne Chen [this message] 2021-07-20 2:48 ` [PATCH v2] mt76: mt7915: fix potential overflow of eeprom page index Shayne Chen
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