From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Date: Thu, 18 Aug 2011 13:36:03 +0000 (+0700)
Subject: fetch-pack: check for valid commit from server
X-Git-Tag: v1.7.6.1~10
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/ec099546a9afdb73b6bf39d5d684e6fb207e2a7f?hp=ec099546a9afdb73b6bf39d5d684e6fb207e2a7f

fetch-pack: check for valid commit from server

A malicious server can return ACK with non-existent SHA-1 or not a
commit. lookup_commit() in this case may return NULL. Do not let
fetch-pack crash by accessing NULL address in this case.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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