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dnsdist: Fix potential pointer wrap-around on 32 bits #5630

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merged 1 commit into from Aug 21, 2017

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rgacogne commented Aug 21, 2017

Short description

This can lead to a DoS on 32 bits if a backend server sends a crafted response and we happen to be working with a buffer allocated to a very high virtual address.

Reported by Guido Vranken (many thanks!).

Checklist

I have:

  • read the CONTRIBUTING.md document
  • compiled and tested this code
  • included documentation (including possible behaviour changes)
  • documented the code
  • added or modified regression test(s)
  • added or modified unit test(s)
dnsdist: Fix potential pointer wrap-around on 32 bits
This can lead to a DoS on 32 bits if a backend server sends a
crafted response and we happen to be working with a buffer allocated to
a very high virtual address.

Reported by Guido Vranken (many thanks!).

@rgacogne rgacogne added this to the dnsdist-1.2.0 milestone Aug 21, 2017

@rgacogne rgacogne merged commit 1c90ce3 into PowerDNS:master Aug 21, 2017

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@rgacogne rgacogne deleted the rgacogne:dnsdist-h1-168297 branch Aug 21, 2017

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