From b2aa84c789a032c60b81d6ad68527e3a9076b99b Mon Sep 17 00:00:00 2001
From: Stefan Beller <sbeller@google.com>
Date: Mon, 14 May 2018 18:04:25 -0700
Subject: grep: handle corrupt index files early

Any other caller of 'repo_read_index' dies upon a negative return of
it, so grep should, too.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/grep.c b/builtin/grep.c
index 5a6cfe6..567565b 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -480,7 +480,8 @@ static int grep_cache(struct grep_opt *opt, struct repository *repo,
 		strbuf_addstr(&name, repo->submodule_prefix);
 	}
 
-	repo_read_index(repo);
+	if (repo_read_index(repo) < 0)
+		die("index file corrupt");
 
 	for (nr = 0; nr < repo->index->cache_nr; nr++) {
 		const struct cache_entry *ce = repo->index->cache[nr];
-- 
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