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receive-pack: use find_commit_header() in check_cert_push_options()

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Use the public function find_commit_header() instead of find_header() to
simplify the code.  This is possible and safe because we're operating on
a strbuf, which is always NUL-terminated, so there is no risk of running
over the end of the buffer.  It cannot contain NUL within the buffer, as
it is built using strbuf_addstr(), only.

The string comparison becomes more complicated because we need to check
for NUL explicitly after comparing the length-limited option, but on the
flip side we don't need to clean up allocations or track the remaining
buffer length.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2024-02-09 21:36:40 +01:00 committed by Junio C Hamano
parent 3526e67d91
commit f51d790b67
1 changed files with 9 additions and 15 deletions
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24
builtin/receive-pack.c
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@ -718,35 +718,29 @@ static const char *check_nonce(const char *buf, size_t len)
static int check_cert_push_options(const struct string_list *push_options) static int check_cert_push_options(const struct string_list *push_options)
{ {
const char *buf = push_cert.buf; const char *buf = push_cert.buf;
int len = push_cert.len;
char *option; const char *option;
const char *next_line; size_t optionlen;
int options_seen = 0; int options_seen = 0;
int retval = 1; int retval = 1;
if (!len) if (!*buf)
return 1; return 1;
while ((option = find_header(buf, len, "push-option", &next_line))) { while ((option = find_commit_header(buf, "push-option", &optionlen))) {
len -= (next_line - buf); buf = option + optionlen + 1;
buf = next_line;
options_seen++; options_seen++;
if (options_seen > push_options->nr if (options_seen > push_options->nr
|| strcmp(option, || strncmp(push_options->items[options_seen - 1].string,
push_options->items[options_seen - 1].string)) { option, optionlen)
retval = 0; || push_options->items[options_seen - 1].string[optionlen])
goto leave; return 0;
}
free(option);
} }
if (options_seen != push_options->nr) if (options_seen != push_options->nr)
retval = 0; retval = 0;
leave:
free(option);
return retval; return retval;
} }