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cpus: Fix configure_icount() error API violation

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The Error ** argument must be NULL, &error_abort, &error_fatal, or a
pointer to a variable containing NULL.  Passing an argument of the
latter kind twice without clearing it in between is wrong: if the
first call sets an error, it no longer points to NULL for the second
call.

configure_icount() is wrong that way.  Harmless, because its @errp is
always &error_abort or &error_fatal.

Just as wrong (and just as harmless): when it fails, it can still
update global state.

Fix all that.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200422130719.28225-4-armbru@redhat.com>
This commit is contained in:
Markus Armbruster
2020-04-22 15:07:08 +02:00
parent 77ed971b9d
commit abc9bf69a6
1 changed files with 30 additions and 21 deletions
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51
cpus.c
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@@ -797,40 +797,49 @@ void cpu_ticks_init(void)
void configure_icount(QemuOpts *opts, Error **errp)
{
const char *option;
const char *option = qemu_opt_get(opts, "shift");
bool sleep = qemu_opt_get_bool(opts, "sleep", true);
bool align = qemu_opt_get_bool(opts, "align", false);
long time_shift = -1;
char *rem_str = NULL;
option = qemu_opt_get(opts, "shift");
if (!option) {
if (qemu_opt_get(opts, "align") != NULL) {
error_setg(errp, "Please specify shift option when using align");
}
if (!option && qemu_opt_get(opts, "align")) {
error_setg(errp, "Please specify shift option when using align");
return;
}
icount_sleep = qemu_opt_get_bool(opts, "sleep", true);
if (align && !sleep) {
error_setg(errp, "align=on and sleep=off are incompatible");
return;
}
if (strcmp(option, "auto") != 0) {
errno = 0;
time_shift = strtol(option, &rem_str, 0);
if (errno != 0 || *rem_str != '\0' || !strlen(option)) {
error_setg(errp, "icount: Invalid shift value");
return;
}
} else if (icount_align_option) {
error_setg(errp, "shift=auto and align=on are incompatible");
return;
} else if (!icount_sleep) {
error_setg(errp, "shift=auto and sleep=off are incompatible");
return;
}
icount_sleep = sleep;
if (icount_sleep) {
timers_state.icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
icount_timer_cb, NULL);
}
icount_align_option = qemu_opt_get_bool(opts, "align", false);
icount_align_option = align;
if (icount_align_option && !icount_sleep) {
error_setg(errp, "align=on and sleep=off are incompatible");
}
if (strcmp(option, "auto") != 0) {
errno = 0;
timers_state.icount_time_shift = strtol(option, &rem_str, 0);
if (errno != 0 || *rem_str != '\0' || !strlen(option)) {
error_setg(errp, "icount: Invalid shift value");
}
if (time_shift >= 0) {
timers_state.icount_time_shift = time_shift;
use_icount = 1;
return;
} else if (icount_align_option) {
error_setg(errp, "shift=auto and align=on are incompatible");
} else if (!icount_sleep) {
error_setg(errp, "shift=auto and sleep=off are incompatible");
}
use_icount = 2;