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RDMA/uverbs: Prevent potential underflow
[ Upstream commita9018adfde
] The issue is in drivers/infiniband/core/uverbs_std_types_cq.c in the UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE) function. We check that: if (attr.comp_vector >= attrs->ufile->device->num_comp_vectors) { But we don't check if "attr.comp_vector" is negative. It could potentially lead to an array underflow. My concern would be where cq->vector is used in the create_cq() function from the cxgb4 driver. And really "attr.comp_vector" is appears as a u32 to user space so that's the right type to use. Fixes:9ee79fce36
("IB/core: Add completion queue (cq) object actions") Link: https://lore.kernel.org/r/20191011133419.GA22905@mwanda Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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2 changed files with 2 additions and 2 deletions
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@ -98,7 +98,7 @@ ib_uverbs_init_udata_buf_or_null(struct ib_udata *udata,
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struct ib_uverbs_device {
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atomic_t refcount;
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int num_comp_vectors;
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u32 num_comp_vectors;
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struct completion comp;
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struct device *dev;
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struct ib_device __rcu *ib_dev;
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@ -310,7 +310,7 @@ struct ib_tm_caps {
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struct ib_cq_init_attr {
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unsigned int cqe;
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int comp_vector;
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u32 comp_vector;
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u32 flags;
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};
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