Jeff King <peff@xxxxxxxx> writes:
> If $GITHEAD_1234abcd is set in the environment, we use its value as a
> "better branch name" in generating conflict markers. However, we pick
> these better names early in the process, and the return value from
> getenv() is not guaranteed to stay valid.
>
> Let's make a copy of the returned string. And to make memory management
> easier, let's just always return an allocated string from
> better_branch_name(), so we know that it must always be freed.
>
> Signed-off-by: Jeff King <peff@xxxxxxxx>
> ---
> builtin/merge-recursive.c | 15 ++++++++++-----
> 1 file changed, 10 insertions(+), 5 deletions(-)
Thanks. Will queue.
>
> diff --git a/builtin/merge-recursive.c b/builtin/merge-recursive.c
> index 9b2f707c29..7545136c2a 100644
> --- a/builtin/merge-recursive.c
> +++ b/builtin/merge-recursive.c
> @@ -7,16 +7,16 @@
> static const char builtin_merge_recursive_usage[] =
> "git %s <base>... -- <head> <remote> ...";
>
> -static const char *better_branch_name(const char *branch)
> +static char *better_branch_name(const char *branch)
> {
> static char githead_env[8 + GIT_MAX_HEXSZ + 1];
> char *name;
>
> if (strlen(branch) != the_hash_algo->hexsz)
> - return branch;
> + return xstrdup(branch);
> xsnprintf(githead_env, sizeof(githead_env), "GITHEAD_%s", branch);
> name = getenv(githead_env);
> - return name ? name : branch;
> + return xstrdup(name ? name : branch);
> }
>
> int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
> @@ -26,6 +26,7 @@ int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
> int i, failed;
> struct object_id h1, h2;
> struct merge_options o;
> + char *better1, *better2;
> struct commit *result;
>
> init_merge_options(&o);
> @@ -70,13 +71,17 @@ int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
> if (get_oid(o.branch2, &h2))
> die(_("could not resolve ref '%s'"), o.branch2);
>
> - o.branch1 = better_branch_name(o.branch1);
> - o.branch2 = better_branch_name(o.branch2);
> + o.branch1 = better1 = better_branch_name(o.branch1);
> + o.branch2 = better2 = better_branch_name(o.branch2);
>
> if (o.verbosity >= 3)
> printf(_("Merging %s with %s\n"), o.branch1, o.branch2);
>
> failed = merge_recursive_generic(&o, &h1, &h2, bases_count, bases, &result);
> +
> + free(better1);
> + free(better2);
> +
> if (failed < 0)
> return 128; /* die() error code */
> return failed;
