There are actually two bugs here.  First, we need to ensure that count
is at least sizeof(u32) or msg.len will be uninitialized data.

The "msg.len" variable is a u32 that comes from the user.  On 32bit
systems the "sizeof_field(struct ipmi_ssif_msg, len) + msg.len"
addition can overflow if "msg.len" is greater than U32_MAX - 4.

Valid lengths for "msg.len" are 1-254.  Add a check for that to
prevent the integer overflow.

Fixes: dd2bc5cc9e25 ("ipmi: ssif_bmc: Add SSIF BMC driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
 drivers/char/ipmi/ssif_bmc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
 drivers/char/ipmi/ssif_bmc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/char/ipmi/ssif_bmc.c b/drivers/char/ipmi/ssif_bmc.c
index 56346fb32872..ab4e87a99f08 100644
--- a/drivers/char/ipmi/ssif_bmc.c
+++ b/drivers/char/ipmi/ssif_bmc.c
@@ -177,13 +177,15 @@ static ssize_t ssif_bmc_write(struct file *file, const char __user *buf, size_t
 	unsigned long flags;
 	ssize_t ret;
 
-	if (count > sizeof(struct ipmi_ssif_msg))
+	if (count < sizeof(msg.len) ||
+	    count > sizeof(struct ipmi_ssif_msg))
 		return -EINVAL;
 
 	if (copy_from_user(&msg, buf, count))
 		return -EFAULT;
 
-	if (!msg.len || count < sizeof_field(struct ipmi_ssif_msg, len) + msg.len)
+	if (!msg.len || msg.len > IPMI_SSIF_PAYLOAD_MAX ||
+	    count < sizeof_field(struct ipmi_ssif_msg, len) + msg.len)
 		return -EINVAL;
 
 	spin_lock_irqsave(&ssif_bmc->lock, flags);
-- 
2.43.0

On Fri, Jun 14, 2024 at 08:30:44PM +0300, Dan Carpenter wrote:
> There are actually two bugs here.  First, we need to ensure that count
> is at least sizeof(u32) or msg.len will be uninitialized data.
> 
> The "msg.len" variable is a u32 that comes from the user.  On 32bit
> systems the "sizeof_field(struct ipmi_ssif_msg, len) + msg.len"
> addition can overflow if "msg.len" is greater than U32_MAX - 4.
> 
> Valid lengths for "msg.len" are 1-254.  Add a check for that to
> prevent the integer overflow.

Thanks, this is in my tree.

-corey

> 
> Fixes: dd2bc5cc9e25 ("ipmi: ssif_bmc: Add SSIF BMC driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> ---
>  drivers/char/ipmi/ssif_bmc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> ---
>  drivers/char/ipmi/ssif_bmc.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/ipmi/ssif_bmc.c b/drivers/char/ipmi/ssif_bmc.c
> index 56346fb32872..ab4e87a99f08 100644
> --- a/drivers/char/ipmi/ssif_bmc.c
> +++ b/drivers/char/ipmi/ssif_bmc.c
> @@ -177,13 +177,15 @@ static ssize_t ssif_bmc_write(struct file *file, const char __user *buf, size_t
>  	unsigned long flags;
>  	ssize_t ret;
>  
> -	if (count > sizeof(struct ipmi_ssif_msg))
> +	if (count < sizeof(msg.len) ||
> +	    count > sizeof(struct ipmi_ssif_msg))
>  		return -EINVAL;
>  
>  	if (copy_from_user(&msg, buf, count))
>  		return -EFAULT;
>  
> -	if (!msg.len || count < sizeof_field(struct ipmi_ssif_msg, len) + msg.len)
> +	if (!msg.len || msg.len > IPMI_SSIF_PAYLOAD_MAX ||
> +	    count < sizeof_field(struct ipmi_ssif_msg, len) + msg.len)
>  		return -EINVAL;
>  
>  	spin_lock_irqsave(&ssif_bmc->lock, flags);
> -- 
> 2.43.0
>