Re: [PATCH] selftests: xfrm: fix test return value override issue in xfrm_policy.sh

[Steffen Klassert <steffen.klassert@secunet.com>]

On Wed, Dec 30, 2020 at 05:52:04PM +0800, Po-Hsu Lin wrote:
> When running this xfrm_policy.sh test script, even with some cases
> marked as FAIL, the overall test result will still be PASS:
> 
> $ sudo ./xfrm_policy.sh
> PASS: policy before exception matches
> FAIL: expected ping to .254 to fail (exceptions)
> PASS: direct policy matches (exceptions)
> PASS: policy matches (exceptions)
> FAIL: expected ping to .254 to fail (exceptions and block policies)
> PASS: direct policy matches (exceptions and block policies)
> PASS: policy matches (exceptions and block policies)
> FAIL: expected ping to .254 to fail (exceptions and block policies after hresh changes)
> PASS: direct policy matches (exceptions and block policies after hresh changes)
> PASS: policy matches (exceptions and block policies after hresh changes)
> FAIL: expected ping to .254 to fail (exceptions and block policies after hthresh change in ns3)
> PASS: direct policy matches (exceptions and block policies after hthresh change in ns3)
> PASS: policy matches (exceptions and block policies after hthresh change in ns3)
> FAIL: expected ping to .254 to fail (exceptions and block policies after htresh change to normal)
> PASS: direct policy matches (exceptions and block policies after htresh change to normal)
> PASS: policy matches (exceptions and block policies after htresh change to normal)
> PASS: policies with repeated htresh change
> $ echo $?
> 0
> 
> This is because the $lret in check_xfrm() is not a local variable.
> Therefore when a test failed in check_exceptions(), the non-zero $lret
> will later get reset to 0 when the next test calls check_xfrm().
> 
> With this fix, the final return value will be 1. Make it easier for
> testers to spot this failure.
> 
> Fixes: 39aa6928d462d0 ("xfrm: policy: fix netlink/pf_key policy lookups")
> Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>

Applied to the ipsec tree, thanks!