Re: [PATCH] RDMA/core: Fix use-after-free in ib_get_eth_speed()

Jason Gunthorpe <[email protected]>
Newsgroups org.kernel.vger.linux-rdma,org.kernel.vger.netdev
Message-ID <[email protected]>
On Fri, Aug 21, 2026 at 07:05:12AM +0000, Eric Dumazet wrote:
> In ib_get_eth_speed(), dev_put(netdev) is called before inspecting
> rc and dereferencing netdev->name in pr_warn(). If dev_put() drops
> the final reference to netdev, netdev->name accesses freed memory.
> 
> Move dev_put(netdev) after the warning block so netdev is kept
> alive while its name is read.
> 
> Fixes: d41861942fc5 ("IB/core: Add generic function to extract IB speed from netdev")
> Signed-off-by: Eric Dumazet <[email protected]>
> ---
>  drivers/infiniband/core/verbs.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

I was intending to take this patch next cycle:

https://patchwork.kernel.org/project/linux-rdma/patch/[email protected]/

Which has the same change embedded?

Jason
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