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Fix rare segfault in sparse-index #690

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merged 2 commits into from
Oct 9, 2024
Merged

Fix rare segfault in sparse-index #690

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b6902f1
sparse-index: do not copy hashtables during expansion
derrickstolee Sep 27, 2024
fbd3e0b
stash: use -f in checkout-index child process
derrickstolee Sep 30, 2024
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2 changes: 1 addition & 1 deletion builtin/stash.c
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Original file line number Diff line number Diff line change
Expand Up @@ -399,7 +399,7 @@ static int restore_untracked(struct object_id *u_tree)

child_process_init(&cp);
cp.git_cmd = 1;
strvec_pushl(&cp.args, "checkout-index", "--all", NULL);
strvec_pushl(&cp.args, "checkout-index", "--all", "-f", NULL);
strvec_pushf(&cp.env, "GIT_INDEX_FILE=%s",
stash_index_path.buf);

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10 changes: 10 additions & 0 deletions sparse-index.c
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Original file line number Diff line number Diff line change
Expand Up @@ -369,6 +369,10 @@ void expand_index(struct index_state *istate, struct pattern_list *pl)
full = xcalloc(1, sizeof(struct index_state));
memcpy(full, istate, sizeof(struct index_state));

full->name_hash_initialized = 0;
memset(&full->name_hash, 0, sizeof(full->name_hash));
memset(&full->dir_hash, 0, sizeof(full->dir_hash));

/*
* This slightly-misnamed 'full' index might still be sparse if we
* are only modifying the list of sparse directories. This hinges
Expand Down Expand Up @@ -427,9 +431,15 @@ void expand_index(struct index_state *istate, struct pattern_list *pl)
}

/* Copy back into original index. */
if (istate->name_hash_initialized) {
hashmap_clear(&istate->name_hash);
hashmap_clear(&istate->dir_hash);
}

istate->name_hash_initialized = full->name_hash_initialized;
memcpy(&istate->name_hash, &full->name_hash, sizeof(full->name_hash));
memcpy(&istate->dir_hash, &full->dir_hash, sizeof(full->dir_hash));

istate->sparse_index = pl ? INDEX_PARTIALLY_SPARSE : INDEX_EXPANDED;
free(istate->cache);
istate->cache = full->cache;
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