[PATCH] vdpa: potential uninitialized return in vhost_vdpa_va_map()

Subsystems: the rest, virtio host (vhost)

STALE1798d LANDED

Landed in mainline as be9c6bad9b46 on 2021-09-14.

3 messages, 3 authors, 2021-09-07 · open the first message on its own page

[PATCH] vdpa: potential uninitialized return in vhost_vdpa_va_map()

From: Dan Carpenter <hidden>
Date: 2021-09-07 07:33:16 

The concern here is that "ret" can be uninitialized if we hit the
"goto next" condition on every iteration through the loop.

Fixes: 41ba1b5f9d4b ("vdpa: Support transferring virtual addressing during DMA mapping")
Signed-off-by: Dan Carpenter <redacted>
---
 drivers/vhost/vdpa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index d0c0fedf2c09..170166806714 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -640,7 +640,7 @@ static int vhost_vdpa_va_map(struct vhost_vdpa *v,
 	u64 offset, map_size, map_iova = iova;
 	struct vdpa_map_file *map_file;
 	struct vm_area_struct *vma;
-	int ret;
+	int ret = 0;
 
 	mmap_read_lock(dev->mm);
 
-- 
2.20.1

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Re: [PATCH] vdpa: potential uninitialized return in vhost_vdpa_va_map()

From: Jason Wang <hidden>
Date: 2021-09-07 09:07:36 

On Tue, Sep 7, 2021 at 3:33 PM Dan Carpenter [off-list ref] wrote:
quoted hunk
The concern here is that "ret" can be uninitialized if we hit the
"goto next" condition on every iteration through the loop.

Fixes: 41ba1b5f9d4b ("vdpa: Support transferring virtual addressing during DMA mapping")
Signed-off-by: Dan Carpenter <redacted>
---
 drivers/vhost/vdpa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index d0c0fedf2c09..170166806714 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -640,7 +640,7 @@ static int vhost_vdpa_va_map(struct vhost_vdpa *v,
        u64 offset, map_size, map_iova = iova;
        struct vdpa_map_file *map_file;
        struct vm_area_struct *vma;
-       int ret;
+       int ret = 0;

        mmap_read_lock(dev->mm);

--
2.20.1
Acked-by: Jason Wang <redacted>

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Re: [PATCH] vdpa: potential uninitialized return in vhost_vdpa_va_map()

From: Stefano Garzarella <sgarzare@redhat.com>
Date: 2021-09-07 09:28:57 

On Tue, Sep 07, 2021 at 10:32:53AM +0300, Dan Carpenter wrote:
quoted hunk
The concern here is that "ret" can be uninitialized if we hit the
"goto next" condition on every iteration through the loop.

Fixes: 41ba1b5f9d4b ("vdpa: Support transferring virtual addressing during DMA mapping")
Signed-off-by: Dan Carpenter <redacted>
---
drivers/vhost/vdpa.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index d0c0fedf2c09..170166806714 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -640,7 +640,7 @@ static int vhost_vdpa_va_map(struct vhost_vdpa *v,
	u64 offset, map_size, map_iova = iova;
	struct vdpa_map_file *map_file;
	struct vm_area_struct *vma;
-	int ret;
+	int ret = 0;

	mmap_read_lock(dev->mm);

-- 
2.20.1

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Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>

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