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[kernel] Check for null handle arg in mailbox_call

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The handle argument to `mailbox_call` is optional, so needs to be
manually checked by the syscall handler before dereferencing.
This commit is contained in:
Justin C. Miller
2023-07-10 01:34:19 -07:00
parent 350396d70f
commit 4bceac3d56
1 changed files with 8 additions and 3 deletions
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11
src/kernel/syscalls/mailbox.cpp
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@@ -39,7 +39,9 @@ mailbox_call(
data.tag = *tag; data.tag = *tag;
data.subtag = *subtag; data.subtag = *subtag;
data.handle = *handle;
if (handle)
data.handle = *handle;
j6_status_t s = self->call(); j6_status_t s = self->call();
if (s != j6_status_ok) if (s != j6_status_ok)
@@ -47,8 +49,11 @@ mailbox_call(
*tag = data.tag; *tag = data.tag;
*subtag = data.subtag; *subtag = data.subtag;
*handle = data.handle;
process::current().add_handle(*handle); if (handle) {
*handle = data.handle;
process::current().add_handle(*handle);
}
return j6_status_ok; return j6_status_ok;
} }