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gdbstub: avoid possible NULL pointer dereference 

Coverity reports that s->chr is checked after put_packet dereferences it.
Move the check earlier, consistent with the code used for user-mode
emulation.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Paolo Bonzini 2015-03-02 13:26:58 +01:00 committed by Michael Tokarev
parent c6dc3dd72b
commit 3d0f441891
1 changed files with 5 additions and 3 deletions
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8
gdbstub.c
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@ -1443,15 +1443,17 @@ void gdb_exit(CPUArchState *env, int code)
if (gdbserver_fd < 0 || s->fd < 0) {
return;
}
#else
if (!s->chr) {
return;
}
#endif
snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
put_packet(s, buf);
#ifndef CONFIG_USER_ONLY
if (s->chr) {
qemu_chr_delete(s->chr);
}
qemu_chr_delete(s->chr);
#endif
}