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Check results of get_darwin_inferior

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I noticed that the existing kill-detach-inferiors-cmd.exp test was
causing gdb to crash on macOS 10.13.  The bug was that an inferior
that hadn't yet been started would cause get_darwin_inferior to return
NULL, and this was not checked.

I went through the places calling get_darwin_inferior and added checks
where appropriate.  This makes the test get a bit further.  Not all of
these spots are exercised by the test, but they seem safe enough in
any case.

gdb/ChangeLog
2018-08-02  Tom Tromey  <tom@tromey.com>

	* darwin-nat.c (find_inferior_task_it, darwin_find_thread)
	(darwin_suspend_inferior, darwin_resume_inferior)
	(darwin_decode_notify_message, darwin_resume_inferior_threads)
	(darwin_check_new_threads): Check result of get_darwin_inferior.
This commit is contained in:
Tom Tromey
2018-07-13 12:45:07 -06:00
parent 8094f49a4d
commit b5bddbbbbc
2 changed files with 28 additions and 14 deletions
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35
gdb/darwin-nat.c
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@ -259,6 +259,9 @@ darwin_check_new_threads (struct inferior *inf)
darwin_inferior *darwin_inf = get_darwin_inferior (inf);
std::vector<darwin_thread_t *> new_thread_vec;
if (darwin_inf == nullptr)
return;
/* Get list of threads. */
kret = task_threads (darwin_inf->task, &thread_list, &new_nbr);
MACH_CHECK_ERROR (kret);
@ -374,7 +377,7 @@ find_inferior_task_it (struct inferior *inf, void *port_ptr)
{
darwin_inferior *priv = get_darwin_inferior (inf);
return priv->task == *(task_t *)port_ptr;
return priv != nullptr && priv->task == *(task_t *)port_ptr;
}
static int
@ -403,11 +406,12 @@ darwin_find_thread (struct inferior *inf, thread_t thread)
{
darwin_inferior *priv = get_darwin_inferior (inf);
for (darwin_thread_t *t : priv->threads)
{
if (t->gdb_port == thread)
return t;
}
if (priv != nullptr)
for (darwin_thread_t *t : priv->threads)
{
if (t->gdb_port == thread)
return t;
}
return NULL;
}
@ -419,7 +423,7 @@ darwin_suspend_inferior (struct inferior *inf)
{
darwin_inferior *priv = get_darwin_inferior (inf);
if (!priv->suspended)
if (priv != nullptr && !priv->suspended)
{
kern_return_t kret;
@ -437,7 +441,7 @@ darwin_resume_inferior (struct inferior *inf)
{
darwin_inferior *priv = get_darwin_inferior (inf);
if (priv->suspended)
if (priv != nullptr && priv->suspended)
{
kern_return_t kret;
@ -766,11 +770,13 @@ darwin_decode_notify_message (mach_msg_header_t *hdr, struct inferior **pinf)
inf = darwin_find_inferior_by_task (task_port);
*pinf = inf;
darwin_inferior *priv = get_darwin_inferior (inf);
/* Check message destination. */
if (inf != NULL && hdr->msgh_local_port != priv->notify_port)
return -4;
if (inf != NULL)
{
darwin_inferior *priv = get_darwin_inferior (inf);
if (hdr->msgh_local_port != priv->notify_port)
return -4;
}
return 0;
}
@ -882,8 +888,9 @@ darwin_resume_inferior_threads (struct inferior *inf, int step, int nsignal)
{
darwin_inferior *priv = get_darwin_inferior (inf);
for (darwin_thread_t *thread : priv->threads)
darwin_resume_thread (inf, thread, step, nsignal);
if (priv != nullptr)
for (darwin_thread_t *thread : priv->threads)
darwin_resume_thread (inf, thread, step, nsignal);
}
struct resume_inferior_threads_param