1. Patchew
  2. QEMU
  3. View series

[Qemu-devel] [PATCH] scsi-disk: Fix crash if request is invaild or disk is no medium

Zhengui li posted 1 patch 6 years, 8 months ago
Test asan failed
Test docker-mingw@fedora passed
Test docker-clang@ubuntu passed
Test checkpatch passed
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/qemu tags/patchew/1551949966-20092-1-git-send-email-lizhengui@huawei.com
Maintainers: Fam Zheng <fam@euphon.net>, Paolo Bonzini <pbonzini@redhat.com>
hw/scsi/scsi-disk.c | 37 ++++++++++++++++++++++++-------------
1 file changed, 24 insertions(+), 13 deletions(-)
[Qemu-devel] [PATCH] scsi-disk: Fix crash if request is invaild or disk is no medium
Posted by Zhengui li 6 years, 8 months ago 
From: Zhengui Li <lizhengui@huawei.com>

Qemu will crash with the assertion error that "assert(r->req.aiocb !=
NULL)" in scsi_read_complete if request is invaild or disk is no medium.
The error is below:
qemu-kvm: hw/scsi/scsi_disk.c:299: scsi_read_complete: Assertion
`r->req.aiocb != NULL' failed.

This patch add a funtion scsi_read_complete_noio to fix it.

Signed-off-by: Zhengui Li <lizhengui@huawei.com>
---
 hw/scsi/scsi-disk.c | 37 ++++++++++++++++++++++++-------------
 1 file changed, 24 insertions(+), 13 deletions(-)

diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index d4e83ae..624df3c 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -296,22 +296,15 @@ static void scsi_dma_complete(void *opaque, int ret)
     aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
 }
 
-static void scsi_read_complete(void * opaque, int ret)
+static void scsi_read_complete_noio(SCSIDiskReq *r, int ret)
 {
-    SCSIDiskReq *r = (SCSIDiskReq *)opaque;
-    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
-    int n;
+    uint32_t n;
 
-    assert(r->req.aiocb != NULL);
-    r->req.aiocb = NULL;
-    aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
-    if (scsi_disk_req_check_error(r, ret, true)) {
+    assert(r->req.aiocb == NULL);
+    if (scsi_disk_req_check_error(r, ret, false)) {
         goto done;
     }
 
-    block_acct_done(blk_get_stats(s->qdev.conf.blk), &r->acct);
-    trace_scsi_disk_read_complete(r->req.tag, r->qiov.size);
-
     n = r->qiov.size / 512;
     r->sector += n;
     r->sector_count -= n;
@@ -319,6 +312,24 @@ static void scsi_read_complete(void * opaque, int ret)
 
 done:
     scsi_req_unref(&r->req);
+}
+
+static void scsi_read_complete(void *opaque, int ret)
+{
+    SCSIDiskReq *r = (SCSIDiskReq *)opaque;
+    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
+
+    assert(r->req.aiocb != NULL);
+    r->req.aiocb = NULL;
+
+    aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
+    if (ret < 0) {
+        block_acct_failed(blk_get_stats(s->qdev.conf.blk), &r->acct);
+    } else {
+        block_acct_done(blk_get_stats(s->qdev.conf.blk), &r->acct);
+        trace_scsi_disk_read_complete(r->req.tag, r->qiov.size);
+    }
+    scsi_read_complete_noio(r, ret);
     aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
 }
 
@@ -395,12 +406,12 @@ static void scsi_read_data(SCSIRequest *req)
     scsi_req_ref(&r->req);
     if (r->req.cmd.mode == SCSI_XFER_TO_DEV) {
         trace_scsi_disk_read_data_invalid();
-        scsi_read_complete(r, -EINVAL);
+        scsi_read_complete_noio(r, -EINVAL);
         return;
     }
 
     if (!blk_is_available(req->dev->conf.blk)) {
-        scsi_read_complete(r, -ENOMEDIUM);
+        scsi_read_complete_noio(r, -ENOMEDIUM);
         return;
     }
 
-- 
2.7.2.windows.1
Re: [Qemu-devel] [PATCH] scsi-disk: Fix crash if request is invaild or disk is no medium
Posted by Eric Blake 6 years, 8 months ago 
On 3/7/19 3:12 AM, Zhengui li wrote:
> From: Zhengui Li <lizhengui@huawei.com>
> 
> Qemu will crash with the assertion error that "assert(r->req.aiocb !=
> NULL)" in scsi_read_complete if request is invaild or disk is no medium.

s/invaild/invalid/

> The error is below:
> qemu-kvm: hw/scsi/scsi_disk.c:299: scsi_read_complete: Assertion
> `r->req.aiocb != NULL' failed.
> 
> This patch add a funtion scsi_read_complete_noio to fix it.
> 

s/funtion/function/

> Signed-off-by: Zhengui Li <lizhengui@huawei.com>
> ---
>  hw/scsi/scsi-disk.c | 37 ++++++++++++++++++++++++-------------
>  1 file changed, 24 insertions(+), 13 deletions(-)
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org
Re: [Qemu-devel] [PATCH] scsi-disk: Fix crash if request is invaild or disk is no medium
Posted by Paolo Bonzini 6 years, 8 months ago 
On 07/03/19 10:12, Zhengui li wrote:
> From: Zhengui Li <lizhengui@huawei.com>
> 
> Qemu will crash with the assertion error that "assert(r->req.aiocb !=
> NULL)" in scsi_read_complete if request is invaild or disk is no medium.
> The error is below:
> qemu-kvm: hw/scsi/scsi_disk.c:299: scsi_read_complete: Assertion
> `r->req.aiocb != NULL' failed.
> 
> This patch add a funtion scsi_read_complete_noio to fix it.
> 
> Signed-off-by: Zhengui Li <lizhengui@huawei.com>
> ---
>  hw/scsi/scsi-disk.c | 37 ++++++++++++++++++++++++-------------
>  1 file changed, 24 insertions(+), 13 deletions(-)
> 
> diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
> index d4e83ae..624df3c 100644
> --- a/hw/scsi/scsi-disk.c
> +++ b/hw/scsi/scsi-disk.c
> @@ -296,22 +296,15 @@ static void scsi_dma_complete(void *opaque, int ret)
>      aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
>  }
>  
> -static void scsi_read_complete(void * opaque, int ret)
> +static void scsi_read_complete_noio(SCSIDiskReq *r, int ret)
>  {
> -    SCSIDiskReq *r = (SCSIDiskReq *)opaque;
> -    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
> -    int n;
> +    uint32_t n;
>  
> -    assert(r->req.aiocb != NULL);
> -    r->req.aiocb = NULL;
> -    aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
> -    if (scsi_disk_req_check_error(r, ret, true)) {
> +    assert(r->req.aiocb == NULL);
> +    if (scsi_disk_req_check_error(r, ret, false)) {
>          goto done;
>      }
>  
> -    block_acct_done(blk_get_stats(s->qdev.conf.blk), &r->acct);
> -    trace_scsi_disk_read_complete(r->req.tag, r->qiov.size);
> -
>      n = r->qiov.size / 512;
>      r->sector += n;
>      r->sector_count -= n;
> @@ -319,6 +312,24 @@ static void scsi_read_complete(void * opaque, int ret)
>  
>  done:
>      scsi_req_unref(&r->req);
> +}
> +
> +static void scsi_read_complete(void *opaque, int ret)
> +{
> +    SCSIDiskReq *r = (SCSIDiskReq *)opaque;
> +    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
> +
> +    assert(r->req.aiocb != NULL);
> +    r->req.aiocb = NULL;
> +
> +    aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
> +    if (ret < 0) {
> +        block_acct_failed(blk_get_stats(s->qdev.conf.blk), &r->acct);
> +    } else {
> +        block_acct_done(blk_get_stats(s->qdev.conf.blk), &r->acct);
> +        trace_scsi_disk_read_complete(r->req.tag, r->qiov.size);
> +    }
> +    scsi_read_complete_noio(r, ret);
>      aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
>  }
>  
> @@ -395,12 +406,12 @@ static void scsi_read_data(SCSIRequest *req)
>      scsi_req_ref(&r->req);
>      if (r->req.cmd.mode == SCSI_XFER_TO_DEV) {
>          trace_scsi_disk_read_data_invalid();
> -        scsi_read_complete(r, -EINVAL);
> +        scsi_read_complete_noio(r, -EINVAL);
>          return;
>      }
>  
>      if (!blk_is_available(req->dev->conf.blk)) {
> -        scsi_read_complete(r, -ENOMEDIUM);
> +        scsi_read_complete_noio(r, -ENOMEDIUM);
>          return;
>      }
>  
> 

Queued, thanks.

Paolo

Patchew 2.1-devel-b67e4c2

© 2016 - 2025 Red Hat, Inc.