From: P J P <ppandit@redhat.com>
To: QEMU Developers <qemu-devel@nongnu.org>
Cc: "Fam Zheng" <fam@euphon.net>,
"Prasad J Pandit" <pjp@fedoraproject.org>,
"Alexander Bulekov" <alxndr@bu.edu>,
"Marc-André Lureau" <marcandre.lureau@redhat.com>,
"Ding Ren" <rding@gatech.edu>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>
Subject: [PATCH v2 2/3] megasas: avoid NULL pointer dereference
Date: Thu, 14 May 2020 00:55:39 +0530 [thread overview]
Message-ID: <20200513192540.1583887-3-ppandit@redhat.com> (raw)
In-Reply-To: <20200513192540.1583887-1-ppandit@redhat.com>
From: Prasad J Pandit <pjp@fedoraproject.org>
While in megasas_handle_frame(), megasas_enqueue_frame() may
set a NULL frame into MegasasCmd object for a given 'frame_addr'
address. Add check to avoid a NULL pointer dereference issue.
Reported-by: Alexander Bulekov <alxndr@bu.edu>
Fixes: https://bugs.launchpad.net/qemu/+bug/1878259
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
---
hw/scsi/megasas.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 6ce598cd69..b531d88a9b 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -504,7 +504,7 @@ static MegasasCmd *megasas_enqueue_frame(MegasasState *s,
cmd->pa = frame;
/* Map all possible frames */
cmd->frame = pci_dma_map(pcid, frame, &frame_size_p, 0);
- if (frame_size_p != frame_size) {
+ if (!cmd->frame || frame_size_p != frame_size) {
trace_megasas_qf_map_failed(cmd->index, (unsigned long)frame);
if (cmd->frame) {
megasas_unmap_frame(s, cmd);
--
2.25.4
next prev parent reply other threads:[~2020-05-13 19:29 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-13 19:25 [PATCH v2 0/3] Megasas: fix OOB access and NULL dereference issues P J P
2020-05-13 19:25 ` [PATCH v2 1/3] megasas: use unsigned type for reply_queue_head and check index P J P
2020-05-13 20:31 ` Alexander Bulekov
2020-05-14 13:19 ` Darren Kenny
2020-05-14 16:10 ` P J P
2020-05-13 19:25 ` P J P [this message]
2020-05-13 20:20 ` [PATCH v2 2/3] megasas: avoid NULL pointer dereference Alexander Bulekov
2020-05-14 13:19 ` Darren Kenny
2020-05-21 15:34 ` Paolo Bonzini
2020-05-26 7:18 ` P J P
2020-05-26 7:49 ` Paolo Bonzini
2020-05-13 19:25 ` [PATCH v2 3/3] megasas: use unsigned type for positive numeric fields P J P
2020-05-14 13:28 ` Darren Kenny
2020-05-21 15:35 ` [PATCH v2 0/3] Megasas: fix OOB access and NULL dereference issues Paolo Bonzini
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