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Re: [PATCH] ls-files: don't try to prune an empty index

Am 16.07.2017 um 12:41 schrieb Jeff King:
On Sat, Jul 15, 2017 at 10:11:20PM +0200, René Scharfe wrote:

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.

Makes sense. We could use MOVE_ARRAY() here, but this is a sensible
short-circuit to the whole function.

Looks like a good solution.

diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index b8514a0029..adf572da68 100644
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -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)
  	pos = index_name_pos(istate, prefix, prefixlen);
  	if (pos < 0)

"git am" complained that this does not apply to its blobs. Did you

I didn't, but perhaps I messed up the order of patches?  MOVE_ARRAY
patch 2 touches the same file, but I wouldn't expect the two changes to
conflict.  So not sure what's going on.