Hello!
> From: coverity-bot, Sent: Saturday, November 5, 2022 4:30 AM
>
> Hello!
>
> This is an experimental semi-automated report about issues detected by
> Coverity from a scan of next-20221104 as part of the linux-next scan project:
<snip>
>
> You're getting this email because you were associated with the identified
> lines of code (noted below) that were touched by commits:
>
> Wed Nov 2 12:38:53 2022 +0000
> 3590918b5d07 ("net: ethernet: renesas: Add support for "Ethernet Switch"")
>
> Coverity reported the following:
>
> *** CID 1527147: Control flow issues (NO_EFFECT)
> drivers/net/ethernet/renesas/rswitch.c:270 in rswitch_gwca_queue_alloc_skb()
> 264 goto err;
> 265 }
> 266
> 267 return 0;
> 268
> 269 err:
> vvv CID 1527147: Control flow issues (NO_EFFECT)
> vvv This greater-than-or-equal-to-zero comparison of an unsigned value is always true. "i >= 0U".
> 270 for (i--; i >= 0; i--) {
> 271 index = (i + start_index) % gq->ring_size;
> 272 dev_kfree_skb(gq->skbs[index]);
> 273 gq->skbs[index] = NULL;
> 274 }
> 275
>
> If this is a false positive, please let us know so we can mark it as
> such, or teach the Coverity rules to be smarter. If not, please make
> sure fixes get into linux-next. :) For patches fixing this, please
> include these lines (but double-check the "Fixes" first):
Thank you for the report! I should fix the driver.
I also realized that rswitch_gwca_queue_ts_fill() has the same issue.
Best regards,
Yoshihiro Shimoda
> Reported-by: coverity-bot <keescook+coverity-bot@xxxxxxxxxxxx>
> Addresses-Coverity-ID: 1527147 ("Control flow issues")
> Fixes: 3590918b5d07 ("net: ethernet: renesas: Add support for "Ethernet Switch"")
>
> Thanks for your attention!
>
> --
> Coverity-bot
