path: root/drivers/infiniband/hw/hfi1/driver.c
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authorDennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>2022-05-20 14:37:12 -0400
committerJason Gunthorpe <jgg@nvidia.com>2022-05-24 15:08:31 -0300
commitf93e91a0372c922c20d5bee260b0f43b4b8a1bee (patch)
tree10cf6219d37e5fdc9eddb2fe25cca4d342dff756 /drivers/infiniband/hw/hfi1/driver.c
parentRDMA/hfi1: Prevent panic when SDMA is disabled (diff)
RDMA/hfi1: Fix potential integer multiplication overflow errors
When multiplying of different types, an overflow is possible even when storing the result in a larger type. This is because the conversion is done after the multiplication. So arithmetic overflow and thus in incorrect value is possible. Correct an instance of this in the inter packet delay calculation. Fix by ensuring one of the operands is u64 which will promote the other to u64 as well ensuring no overflow. Cc: stable@vger.kernel.org Fixes: 7724105686e7 ("IB/hfi1: add driver files") Link: https://lore.kernel.org/r/20220520183712.48973.29855.stgit@awfm-01.cornelisnetworks.com Reviewed-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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