From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38269) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d2clS-0001KD-IG for qemu-devel@nongnu.org; Mon, 24 Apr 2017 08:06:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d2clP-0003qP-EE for qemu-devel@nongnu.org; Mon, 24 Apr 2017 08:06:46 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58260) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d2clP-0003p4-7t for qemu-devel@nongnu.org; Mon, 24 Apr 2017 08:06:43 -0400 From: P J P Date: Mon, 24 Apr 2017 17:36:34 +0530 Message-Id: <20170424120634.12268-1-ppandit@redhat.com> Subject: [Qemu-devel] [PATCH] scsi: avoid an off-by-one error in megasas_mmio_write List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Qemu Developers Cc: YY Z , Paolo Bonzini , Prasad J Pandit From: Prasad J Pandit While reading magic sequence(MFI_SEQ) in megasas_mmio_write, an off-by-one error could occur as 's->adp_reset' index is not reset after reading the last sequence. Reported-by: YY Z Signed-off-by: Prasad J Pandit --- hw/scsi/megasas.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c index 84b8caf..804122a 100644 --- a/hw/scsi/megasas.c +++ b/hw/scsi/megasas.c @@ -2138,15 +2138,15 @@ static void megasas_mmio_write(void *opaque, hwaddr addr, case MFI_SEQ: trace_megasas_mmio_writel("MFI_SEQ", val); /* Magic sequence to start ADP reset */ - if (adp_reset_seq[s->adp_reset] == val) { - s->adp_reset++; + if (adp_reset_seq[s->adp_reset++] == val) { + if (s->adp_reset == 6) { + s->adp_reset = 0; + s->diag = MFI_DIAG_WRITE_ENABLE; + } } else { s->adp_reset = 0; s->diag = 0; } - if (s->adp_reset == 6) { - s->diag = MFI_DIAG_WRITE_ENABLE; - } break; case MFI_DIAG: trace_megasas_mmio_writel("MFI_DIAG", val); -- 2.9.3