diff options
| author | Yann Droneaud <[email protected]> | 2015-04-13 14:56:22 +0200 |
|---|---|---|
| committer | Doug Ledford <[email protected]> | 2015-04-15 16:05:02 -0400 |
| commit | 8abaae62f3fdead8f4ce0ab46b4ab93dee39bab2 (patch) | |
| tree | a1d8a82a86b64c1f8b6823030c77242af4b790a3 | |
| parent | c841e12add6926d64aa608687893465330b5a03e (diff) | |
IB/core: disallow registering 0-sized memory region
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/[email protected]
Cc: <[email protected]>
Cc: Shachar Raindel <[email protected]>
Cc: Jack Morgenstein <[email protected]>
Cc: Or Gerlitz <[email protected]>
Signed-off-by: Yann Droneaud <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>
| -rw-r--r-- | drivers/infiniband/core/umem.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index 8c014b5dab4c..9ac4068d2088 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -99,6 +99,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, if (dmasync) dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs); + 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. |