Re: [PATCH net v4] net: usb: sr9700: fix uninitialized variable use in sr_mdio_read

[Hariprasad Kelam]

On 2024-07-25 at 08:31:00, Shigeru Yoshida (syoshida@xxxxxxxxxx) wrote:
> On Thu, 25 Jul 2024 10:29:42 +0800, Ma Ke wrote:
> > It could lead to error happen because the variable res is not updated if
> > the call to sr_share_read_word returns an error. In this particular case
> > error code was returned and res stayed uninitialized. Same issue also
> > applies to sr_read_reg.
> > 
> > This can be avoided by checking the return value of sr_share_read_word
> > and sr_read_reg, and propagating the error if the read operation failed.
> > 
> > Found by code review.
> > 
> > Cc: stable@xxxxxxxxxxxxxxx
> > Fixes: c9b37458e956 ("USB2NET : SR9700 : One chip USB 1.1 USB2NET SR9700Device Driver Support")
> > Signed-off-by: Ma Ke <make24@xxxxxxxxxxx>
> 
> I did a quick check for sr9700.c and there seems to be other
> suspicious usage of sr_read_reg().  But, for sr_mdio_read(), I think
> the patch is sufficient.
> 
> Reviewed-by: Shigeru Yoshida <syoshida@xxxxxxxxxx>
> 
>  Agree with Shigeru, may be you can submit another patch addressing
>  "suspicious usage of sr_read_reg" this patch looks good

Reviewed-by: Hariprasad Kelam <hkelam@xxxxxxxxxxx>