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option: Assert value string isn't null

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Plenty of code relies on QemuOpt member @str not being null, including
qemu_opts_print(), qemu_opts_to_qdict(), and callbacks passed to
qemu_opt_foreach().

Begs the question whether it can be null.  Only opt_set() creates
QemuOpt.  It sets member @str to its argument @value.  Passing null
for @value would plant a time bomb.  Callers:

* opts_do_parse() can't pass null.

* qemu_opt_set() passes its argument @value.  Callers:

  - qemu_opts_from_qdict_1() can't pass null

  - qemu_opts_set() passes its argument @value, but none of its
    callers pass null.

  - Many more outside qemu-option.c, but they shouldn't pass null,
    either.

Assert member @str isn't null, so that misuse is caught right away.

Simplify parse_option_bool(), parse_option_number() and
parse_option_size() accordingly.  Best viewed with whitespace changes
ignored.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1487708048-2131-3-git-send-email-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2017-02-21 21:13:46 +01:00
parent 694baf57ae
commit 8ee8409eff
1 changed files with 39 additions and 50 deletions
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89
util/qemu-option.c
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@ -128,17 +128,13 @@ int get_param_value(char *buf, int buf_size,
static void parse_option_bool(const char *name, const char *value, bool *ret,
Error **errp)
{
if (value != NULL) {
if (!strcmp(value, "on")) {
*ret = 1;
} else if (!strcmp(value, "off")) {
*ret = 0;
} else {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
name, "'on' or 'off'");
}
} else {
if (!strcmp(value, "on")) {
*ret = 1;
} else if (!strcmp(value, "off")) {
*ret = 0;
} else {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
name, "'on' or 'off'");
}
}
@ -148,16 +144,12 @@ static void parse_option_number(const char *name, const char *value,
char *postfix;
uint64_t number;
if (value != NULL) {
number = strtoull(value, &postfix, 0);
if (*postfix != '\0') {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
return;
}
*ret = number;
} else {
number = strtoull(value, &postfix, 0);
if (*postfix != '\0') {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
return;
}
*ret = number;
}
static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
@ -180,39 +172,35 @@ void parse_option_size(const char *name, const char *value,
char *postfix;
double sizef;
if (value != NULL) {
sizef = strtod(value, &postfix);
if (sizef < 0 || sizef > UINT64_MAX) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
"a non-negative number below 2^64");
return;
}
switch (*postfix) {
case 'T':
sizef *= 1024;
/* fall through */
case 'G':
sizef *= 1024;
/* fall through */
case 'M':
sizef *= 1024;
/* fall through */
case 'K':
case 'k':
sizef *= 1024;
/* fall through */
case 'b':
case '\0':
*ret = (uint64_t) sizef;
break;
default:
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
error_append_hint(errp, "You may use k, M, G or T suffixes for "
"kilobytes, megabytes, gigabytes and terabytes.\n");
return;
}
} else {
sizef = strtod(value, &postfix);
if (sizef < 0 || sizef > UINT64_MAX) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
"a non-negative number below 2^64");
return;
}
switch (*postfix) {
case 'T':
sizef *= 1024;
/* fall through */
case 'G':
sizef *= 1024;
/* fall through */
case 'M':
sizef *= 1024;
/* fall through */
case 'K':
case 'k':
sizef *= 1024;
/* fall through */
case 'b':
case '\0':
*ret = (uint64_t) sizef;
break;
default:
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
error_append_hint(errp, "You may use k, M, G or T suffixes for "
"kilobytes, megabytes, gigabytes and terabytes.\n");
return;
}
}
@ -566,6 +554,7 @@ static void opt_set(QemuOpts *opts, const char *name, const char *value,
}
opt->desc = desc;
opt->str = g_strdup(value);
assert(opt->str);
qemu_opt_parse(opt, &local_err);
if (local_err) {
error_propagate(errp, local_err);