[U-Boot] [PATCH] kwbimage: fixing the issue with proper return code checking

[Stefan Roese]

On 17.04.19 12:53, Young Xiao wrote:
> EVP_VerifyFinal would return one of three values:
> 1 if the data is verified to be correct;
> 0 if it is incorrect;
> -1 if there is any failure in the verification process.
> 
> The varification in unpatched version is wrong, since it ignored
> the return value of -1.
> 
> The bug allows a malformed signature to be treated as a good
> signature rather than as an error. This issue affects the
> signature checks on DSA ans ECDSA keys used with SSL/TLS.
> 
> This issue is similar to CVE-2008-5077, CVE-2009-0021,
> CVE-2009-0025, CVE-2009-0046 ~ CVE-2009-0049.
> 
> Signed-off-by: Young Xiao <92siuyang at gmail.com>

Applied to u-boot-marvell/master.

Thanks,
Stefan