| Message ID | CA+UBctD1E5ZLnBxkrXh3uxiKiKXphnLKiB=5whYtH73SCTESWw@mail.gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | net: lan78xx: Fix possible uninit bug | expand |
On Tue, 4 Jul 2023 18:15:09 -0700 Yu Hao <yhao016@ucr.edu> wrote: > The variable buf should be initialized in the function lan78xx_read_reg. > However, there is no return value check, which means the variable buf > could still be uninit. But there is a read later. > > Signed-off-by: Yu Hao <yhao016@ucr.edu> > --- > drivers/net/usb/lan78xx.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c > index c458c030fadf..4c9318c92fe6 100644 > --- a/drivers/net/usb/lan78xx.c > +++ b/drivers/net/usb/lan78xx.c > @@ -1091,8 +1091,11 @@ static int lan78xx_write_raw_otp(struct > lan78xx_net *dev, u32 offset, > int i; > u32 buf; > unsigned long timeout; > + int ret; > > - lan78xx_read_reg(dev, OTP_PWR_DN, &buf); > + ret = lan78xx_read_reg(dev, OTP_PWR_DN, &buf); > + if (ret < 0) > + return ret; > > if (buf & OTP_PWR_DN_PWRDN_N_) { > /* clear it and wait to be cleared */ Reviewed-by: Herve Codina <herve.codina@bootlin.com> Best regards, Hervé
On Tue, Jul 04, 2023 at 06:15:09PM -0700, Yu Hao wrote: > The variable buf should be initialized in the function lan78xx_read_reg. > However, there is no return value check, which means the variable buf > could still be uninit. But there is a read later. > > Signed-off-by: Yu Hao <yhao016@ucr.edu> > --- > drivers/net/usb/lan78xx.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c > index c458c030fadf..4c9318c92fe6 100644 > --- a/drivers/net/usb/lan78xx.c > +++ b/drivers/net/usb/lan78xx.c > @@ -1091,8 +1091,11 @@ static int lan78xx_write_raw_otp(struct > lan78xx_net *dev, u32 offset, > int i; > u32 buf; > unsigned long timeout; > + int ret; > > - lan78xx_read_reg(dev, OTP_PWR_DN, &buf); > + ret = lan78xx_read_reg(dev, OTP_PWR_DN, &buf); > + if (ret < 0) > + return ret; > > if (buf & OTP_PWR_DN_PWRDN_N_) { > /* clear it and wait to be cleared */ > -- > 2.34.1 Hi, This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree. You are receiving this message because of the following common error(s) as indicated below: - Your patch is malformed (tabs converted to spaces, linewrapped, etc.) and can not be applied. Please read the file, Documentation/process/email-clients.rst in order to fix this. If you wish to discuss this problem further, or you have questions about how to resolve this issue, please feel free to respond to this email and Greg will reply once he has dug out from the pending patches received from other developers. thanks, greg k-h's patch email bot
diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index c458c030fadf..4c9318c92fe6 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -1091,8 +1091,11 @@ static int lan78xx_write_raw_otp(struct lan78xx_net *dev, u32 offset, int i; u32 buf; unsigned long timeout; + int ret; - lan78xx_read_reg(dev, OTP_PWR_DN, &buf); + ret = lan78xx_read_reg(dev, OTP_PWR_DN, &buf); + if (ret < 0) + return ret; if (buf & OTP_PWR_DN_PWRDN_N_) {
The variable buf should be initialized in the function lan78xx_read_reg. However, there is no return value check, which means the variable buf could still be uninit. But there is a read later. Signed-off-by: Yu Hao <yhao016@ucr.edu> --- drivers/net/usb/lan78xx.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) /* clear it and wait to be cleared */