Re: Coverity: meson_cipher(): RESOURCE_LEAK

[LABBE Corentin <clabbe@baylibre.com>]

On Mon, Nov 04, 2019 at 09:35:05AM -0800, coverity-bot wrote:
> Hello!
> 
> This is an experimental automated report about issues detected by Coverity
> from a scan of next-20191031 as part of the linux-next weekly scan project:
> https://scan.coverity.com/projects/linux-next-weekly-scan
> 
> You're getting this email because you were associated with the identified
> lines of code (noted below) that were touched by recent commits:
> 
> 48fe583fe541 ("crypto: amlogic - Add crypto accelerator for amlogic GXL")
> 
> Coverity reported the following:
> 
> *** CID 1487403:    (RESOURCE_LEAK)
> /drivers/crypto/amlogic/amlogic-gxl-cipher.c: 258 in meson_cipher()
> 252     						 ivsize, 0);
> 253     		}
> 254     	}
> 255     theend:
> 256     	kzfree(bkeyiv);
> 257
> vvv     CID 1487403:    (RESOURCE_LEAK)
> vvv     Variable "backup_iv" going out of scope leaks the storage it points to.
> 258     	return err;
> 259     }
> 260
> 261     static int meson_handle_cipher_request(struct crypto_engine *engine,
> 262     				       void *areq)
> 263     {
> /drivers/crypto/amlogic/amlogic-gxl-cipher.c: 156 in meson_cipher()
> 150     		keyivlen = 32;
> 151
> 152     	phykeyiv = dma_map_single(mc->dev, bkeyiv, keyivlen,
> 153     				  DMA_TO_DEVICE);
> 154     	if (dma_mapping_error(mc->dev, phykeyiv)) {
> 155     		dev_err(mc->dev, "Cannot DMA MAP KEY IV\n");
> vvv     CID 1487403:    (RESOURCE_LEAK)
> vvv     Variable "backup_iv" going out of scope leaks the storage it points to.
> 156     		return -EFAULT;
> 157     	}
> 158
> 159     	tloffset = 0;
> 160     	eat = 0;
> 161     	i = 0;
> 
> 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):
> 
> Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
> Addresses-Coverity-ID: 1487403 ("RESOURCE_LEAK")
> Fixes: 48fe583fe541 ("crypto: amlogic - Add crypto accelerator for amlogic GXL")
> 
> 
> Thanks for your attention!
> 

I will send the fix soon.

Thanks