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psd: add basic validation of userspace matchinfo data

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psd multiplies weight_thresh by HZ, so it could overflow.

Userspace libxt_psd refuses values exceeding PSD_MAX_RATE, so check
that on kernel side, too.

Also, setting 0 weight for both privileged and highports will cause
psd to never match at all.

Reject 0 weight threshold, too because it makes no sense (triggers
match for every initial packet).
This commit is contained in:
Florian Westphal
2012-06-02 21:13:58 +02:00
committed by Jan Engelhardt
parent ac58f2e94b
commit f6b8767228
2 changed files with 30 additions and 6 deletions
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doc/changelog.txt
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@@ -3,6 +3,8 @@ HEAD
====
Fixes:
- xt_psd: avoid crash due to curr->next corruption
Changes:
- xt_psd: reject invalid match options
v1.42 (2012-04-05)