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bisect--helper: avoid segfault with bad syntax in start --term-*

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06f5608c14 (bisect--helper: `bisect_start` shell function partially in C,
2019-01-02) adds a lax parser for `git bisect start` which could result
in a segfault under a bad syntax call for start with custom terms.

Detect if there are enough arguments left in the command line to use for
--term-{old,good,new,bad} and abort with the same syntax error the original
implementation will show if not.

While at it, remove an unnecessary (and incomplete) check for unknown
arguments and make sure to add a test to avoid regressions.

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Acked-by: Christian Couder <christian.couder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Carlo Marcelo Arenas Belón
2020-05-20 16:26:27 -07:00
committed by Junio C Hamano
parent 06f5608c14
commit 4d9005ff5d
2 changed files with 11 additions and 4 deletions
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13
builtin/bisect--helper.c
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@ -452,9 +452,12 @@ static int bisect_start(struct bisect_terms *terms, int no_checkout,
no_checkout = 1;
} else if (!strcmp(arg, "--term-good") ||
!strcmp(arg, "--term-old")) {
i++;
if (argc <= i)
return error(_("'' is not a valid term"));
must_write_terms = 1;
free((void *) terms->term_good);
terms->term_good = xstrdup(argv[++i]);
terms->term_good = xstrdup(argv[i]);
} else if (skip_prefix(arg, "--term-good=", &arg) ||
skip_prefix(arg, "--term-old=", &arg)) {
must_write_terms = 1;
@ -462,16 +465,18 @@ static int bisect_start(struct bisect_terms *terms, int no_checkout,
terms->term_good = xstrdup(arg);
} else if (!strcmp(arg, "--term-bad") ||
!strcmp(arg, "--term-new")) {
i++;
if (argc <= i)
return error(_("'' is not a valid term"));
must_write_terms = 1;
free((void *) terms->term_bad);
terms->term_bad = xstrdup(argv[++i]);
terms->term_bad = xstrdup(argv[i]);
} else if (skip_prefix(arg, "--term-bad=", &arg) ||
skip_prefix(arg, "--term-new=", &arg)) {
must_write_terms = 1;
free((void *) terms->term_bad);
terms->term_bad = xstrdup(arg);
} else if (starts_with(arg, "--") &&
!one_of(arg, "--term-good", "--term-bad", NULL)) {
} else if (starts_with(arg, "--")) {
return error(_("unrecognized option: '%s'"), arg);
} else {
char *commit_id = xstrfmt("%s^{commit}", arg);