[PATCH 3.4 046/146] IB/core: disallow registering 0-sized memory region

[lizf]

From: Yann Droneaud 

3.4.109-rc1 review patch.  If anyone has any objections, please let me know.

--


commit 8abaae62f3fdead8f4ce0ab46b4ab93dee39bab2 upstream.

If ib_umem_get() is called with a size equal to 0 and an
non-page aligned address, one page will be pinned and a
0-sized umem will be returned to the caller.

This should not be allowed: it's not expected for a memory
region to have a size equal to 0.

This patch adds a check to explicitly refuse to register
a 0-sized region.

Link: http://mid.gmane.org/cover.1428929103.git.ydrone...@opteya.com
Cc: Shachar Raindel 
Cc: Jack Morgenstein 
Cc: Or Gerlitz 
Signed-off-by: Yann Droneaud 
Signed-off-by: Doug Ledford 
Signed-off-by: Zefan Li 
---
 drivers/infiniband/core/umem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index d0254be..c1fef27 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -94,6 +94,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, 
unsigned long addr,
if (dmasync)
dma_set_attr(DMA_ATTR_WRITE_BARRIER, );
 
+   if (!size)
+   return ERR_PTR(-EINVAL);
+
/*
 * If the combination of the addr and size requested for this memory
 * region causes an integer overflow, return error.
-- 
1.9.1

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[PATCH 3.4 046/146] IB/core: disallow registering 0-sized memory region

[lizf]

From: Yann Droneaud 

3.4.109-rc1 review patch.  If anyone has any objections, please let me know.

--


commit 8abaae62f3fdead8f4ce0ab46b4ab93dee39bab2 upstream.

If ib_umem_get() is called with a size equal to 0 and an
non-page aligned address, one page will be pinned and a
0-sized umem will be returned to the caller.

This should not be allowed: it's not expected for a memory
region to have a size equal to 0.

This patch adds a check to explicitly refuse to register
a 0-sized region.

Link: http://mid.gmane.org/cover.1428929103.git.ydrone...@opteya.com
Cc: Shachar Raindel 
Cc: Jack Morgenstein 
Cc: Or Gerlitz 
Signed-off-by: Yann Droneaud 
Signed-off-by: Doug Ledford 
Signed-off-by: Zefan Li 
---
 drivers/infiniband/core/umem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index d0254be..c1fef27 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -94,6 +94,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, 
unsigned long addr,
if (dmasync)
dma_set_attr(DMA_ATTR_WRITE_BARRIER, );
 
+   if (!size)
+   return ERR_PTR(-EINVAL);
+
/*
 * If the combination of the addr and size requested for this memory
 * region causes an integer overflow, return error.
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/