Re: [PATCH] e1000e: fix heap overflow in e1000_set_eeprom()

[Andrew Lunn <andrew@lunn.ch>]

On Tue, May 27, 2025 at 11:13:32PM +0200, Mikael Wessel wrote:
> The ETHTOOL_SETEEPROM ioctl copies user data into a kmalloc'ed buffer
> without validating eeprom->len and eeprom->offset. A CAP_NET_ADMIN
> user can overflow the heap and crash the kernel or gain code execution.
> 
> Validate length and offset before kmalloc() to avoid leaking eeprom_buff.
> 
> Fixes: bc7f75fa9788 ("[E1000E]: New pci-express e1000 driver (currently for ICH9 devices only)")
> Reported-by: Mikael Wessel <post@mikaelkw.online>
> Signed-off-by: Mikael Wessel <post@mikaelkw.online>
> Cc: stable@vger.kernel.org
> ---
>  drivers/net/ethernet/intel/e1000e/ethtool.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
> index 98e541e39730..d04e59528619 100644
> --- a/drivers/net/ethernet/intel/e1000e/ethtool.c
> +++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
> @@ -561,7 +561,7 @@ static int e1000_set_eeprom(struct net_device *netdev,
>  		return -EOPNOTSUPP;
>  
>  	if (eeprom->magic !=
> -	    (adapter->pdev->vendor | (adapter->pdev->device << 16)))
> +		(adapter->pdev->vendor | (adapter->pdev->device << 16)))
>  		return -EFAULT;

That look like a white space change, which should not be part of a
fix.

Please also take a read of

https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html

You need to set the tree in the Subject line.

    Andrew

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