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From: Darren Kenny <darren.kenny@oracle.com>
To: P J P <ppandit@redhat.com>, 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: Re: [PATCH v2 2/3] megasas: avoid NULL pointer dereference
Date: Thu, 14 May 2020 14:19:26 +0100	[thread overview]
Message-ID: <m2h7wik61t.fsf@oracle.com> (raw)
In-Reply-To: <20200513192540.1583887-3-ppandit@redhat.com>

On Thursday, 2020-05-14 at 00:55:39 +0530, P J P wrote:
> 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>

Reviewed-by: Darren Kenny <darren.kenny@oracle.com>

> ---
>  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


  parent reply	other threads:[~2020-05-14 13:22 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 ` [PATCH v2 2/3] megasas: avoid NULL pointer dereference P J P
2020-05-13 20:20   ` Alexander Bulekov
2020-05-14 13:19   ` Darren Kenny [this message]
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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