| commit | 6e37c8ed3c899385651f5beac1f1588fe3c1f5fb | [log] [tgz] |
|---|---|---|
| author | Nguyễn Thái Ngọc Duy <pclouds@gmail.com> | Wed Feb 13 16:51:29 2019 +0700 |
| committer | Junio C Hamano <gitster@pobox.com> | Wed Feb 13 12:52:48 2019 -0800 |
| tree | f300f7ac137f0a175ee8ca3759eb9941c421bf31 | |
| parent | 98cdfbb84ad2ed6a2eb43dafa357a70a4b0a0fad [diff] |
read-cache.c: fix writing "link" index ext with null base oid
Since commit 7db118303a (unpack_trees: fix breakage when o->src_index !=
o->dst_index - 2018-04-23) and changes in merge code to use separate
index_state for source and destination, when doing a merge with split
index activated, we may run into this line in unpack_trees():
o->result.split_index = init_split_index(&o->result);
This is by itself not wrong. But this split index information is not
fully populated (and it's only so when move_cache_to_base_index() is
called, aka force splitting the index, or loading index_state from a
file). Both "base_oid" and "base" in this case remain null.
So when writing the main index down, we link to this index with null
oid (default value after init_split_index()), which also means "no split
index" internally. This triggers an incorrect base index refresh:
warning: could not freshen shared index '.../sharedindex.0{40}'
This patch makes sure we will not refresh null base_oid (because the
file is never there). It also makes sure not to write "link" extension
with null base_oid in the first place (no point having it at
all). Read code already has protection against null base_oid.
There is also another side fix in remove_split_index() that causes a
crash when doing "git update-index --no-split-index" when base_oid in
the index file is null. In this case we will not load
istate->split_index->base but we dereference it anyway and are rewarded
with a segfault. This should not happen anymore, but it's still wrong to
dereference a potential NULL pointer, especially when we do check for
NULL pointer in the next code.
Reported-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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