From: Pavel Skripkin paskripkin@gmail.com
mainline inclusion from mainline-v5.14-rc7 commit a786e3195d6af183033e86f0518ffd2c51c0e8ac category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I95RDW CVE: CVE-2021-47101
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Syzbot reported uninit-value in asix_mdio_read(). The problem was in missing error handling. asix_read_cmd() should initialize passed stack variable smsr, but it can fail in some cases. Then while condidition checks possibly uninit smsr variable.
Since smsr is uninitialized stack variable, driver can misbehave, because smsr will be random in case of asix_read_cmd() failure. Fix it by adding error handling and just continue the loop instead of checking uninit value.
Added helper function for checking Host_En bit, since wrong loop was used in 4 functions and there is no need in copy-pasting code parts.
Cc: Robert Foss robert.foss@collabora.com Fixes: d9fe64e51114 ("net: asix: Add in_pm parameter") Reported-by: syzbot+a631ec9e717fb0423053@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin paskripkin@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Cheng Yu serein.chengyu@huawei.com --- drivers/net/usb/asix_common.c | 71 +++++++++++++++-------------------- 1 file changed, 31 insertions(+), 40 deletions(-)
diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c index 023b8d0bf175..1787cb3c4097 100644 --- a/drivers/net/usb/asix_common.c +++ b/drivers/net/usb/asix_common.c @@ -75,6 +75,29 @@ void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index, value, index, data, size); }
+static int asix_check_host_enable(struct usbnet *dev, int in_pm) +{ + int i, ret; + u8 smsr; + + for (i = 0; i < 30; ++i) { + ret = asix_set_sw_mii(dev, in_pm); + if (ret == -ENODEV || ret == -ETIMEDOUT) + break; + usleep_range(1000, 1100); + ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, + 0, 0, 1, &smsr, in_pm); + if (ret == -ENODEV) + break; + else if (ret < 0) + continue; + else if (smsr & AX_HOST_EN) + break; + } + + return ret; +} + static void reset_asix_rx_fixup_info(struct asix_rx_fixup_info *rx) { /* Reset the variables that have a lifetime outside of @@ -458,19 +481,11 @@ int asix_mdio_read(struct net_device *netdev, int phy_id, int loc) { struct usbnet *dev = netdev_priv(netdev); __le16 res; - u8 smsr; - int i = 0; int ret;
mutex_lock(&dev->phy_mutex); - do { - ret = asix_set_sw_mii(dev, 0); - if (ret == -ENODEV || ret == -ETIMEDOUT) - break; - usleep_range(1000, 1100); - ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, - 0, 0, 1, &smsr, 0); - } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV)); + + ret = asix_check_host_enable(dev, 0); if (ret == -ENODEV || ret == -ETIMEDOUT) { mutex_unlock(&dev->phy_mutex); return ret; @@ -491,22 +506,14 @@ void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val) { struct usbnet *dev = netdev_priv(netdev); __le16 res = cpu_to_le16(val); - u8 smsr; - int i = 0; int ret;
netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n", phy_id, loc, val);
mutex_lock(&dev->phy_mutex); - do { - ret = asix_set_sw_mii(dev, 0); - if (ret == -ENODEV) - break; - usleep_range(1000, 1100); - ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, - 0, 0, 1, &smsr, 0); - } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV)); + + ret = asix_check_host_enable(dev, 0); if (ret == -ENODEV) { mutex_unlock(&dev->phy_mutex); return; @@ -522,19 +529,11 @@ int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc) { struct usbnet *dev = netdev_priv(netdev); __le16 res; - u8 smsr; - int i = 0; int ret;
mutex_lock(&dev->phy_mutex); - do { - ret = asix_set_sw_mii(dev, 1); - if (ret == -ENODEV || ret == -ETIMEDOUT) - break; - usleep_range(1000, 1100); - ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, - 0, 0, 1, &smsr, 1); - } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV)); + + ret = asix_check_host_enable(dev, 1); if (ret == -ENODEV || ret == -ETIMEDOUT) { mutex_unlock(&dev->phy_mutex); return ret; @@ -556,22 +555,14 @@ asix_mdio_write_nopm(struct net_device *netdev, int phy_id, int loc, int val) { struct usbnet *dev = netdev_priv(netdev); __le16 res = cpu_to_le16(val); - u8 smsr; - int i = 0; int ret;
netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n", phy_id, loc, val);
mutex_lock(&dev->phy_mutex); - do { - ret = asix_set_sw_mii(dev, 1); - if (ret == -ENODEV) - break; - usleep_range(1000, 1100); - ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, - 0, 0, 1, &smsr, 1); - } while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV)); + + ret = asix_check_host_enable(dev, 1); if (ret == -ENODEV) { mutex_unlock(&dev->phy_mutex); return;