3.16.7-ckt11 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Yann Droneaud <ydroneaud@xxxxxxxxxx> 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.ydroneaud@xxxxxxxxxx Cc: Shachar Raindel <raindel@xxxxxxxxxxxx> Cc: Jack Morgenstein <jackm@xxxxxxxxxxxx> Cc: Or Gerlitz <ogerlitz@xxxxxxxxxxxx> Signed-off-by: Yann Droneaud <ydroneaud@xxxxxxxxxx> Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx> Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx> --- 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 0b2584dbeba0..9cc7af4bca94 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, &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. -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html