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ls-files: don't try to prune an empty index

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Exit early when asked to prune an index that contains no entries to
begin with.  This avoids pointer arithmetic on istate->cache, which is
possibly NULL in that case.

Found with Clang's UBSan.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2017-07-16 13:16:01 +02:00 committed by Junio C Hamano
parent 177366415b
commit 168e63554c
1 changed files with 1 additions and 1 deletions
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2
builtin/ls-files.c
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@ -362,7 +362,7 @@ static void prune_index(struct index_state *istate,
int pos;
unsigned int first, last;
if (!prefix)
if (!prefix || !istate->cache_nr)
return;
pos = index_name_pos(istate, prefix, prefixlen);
if (pos < 0)