| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 11/76] RDMA/ocrdma: Fix use after free in ocrdma_dealloc_ucontext_pd() | Date | Mon, 18 Jan 2021 12:34:11 +0100 |
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From: Tom Rix <trix@redhat.com>
commit f2bc3af6353cb2a33dfa9d270d999d839eef54cb upstream.
In ocrdma_dealloc_ucontext_pd() uctx->cntxt_pd is assigned to the variable pd and then after uctx->cntxt_pd is freed, the variable pd is passed to function _ocrdma_dealloc_pd() which dereferences pd directly or through its call to ocrdma_mbx_dealloc_pd().
Reorder the free using the variable pd.
Cc: stable@vger.kernel.org Fixes: 21a428a019c9 ("RDMA: Handle PD allocations by IB/core") Link: https://lore.kernel.org/r/20201230024653.1516495-1-trix@redhat.com Signed-off-by: Tom Rix <trix@redhat.com> Reviewed-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c +++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c @@ -442,9 +442,9 @@ static void ocrdma_dealloc_ucontext_pd(s pr_err("%s(%d) Freeing in use pdid=0x%x.\n", __func__, dev->id, pd->id); } - kfree(uctx->cntxt_pd); uctx->cntxt_pd = NULL; _ocrdma_dealloc_pd(dev, pd); + kfree(pd); } static struct ocrdma_pd *ocrdma_get_ucontext_pd(struct ocrdma_ucontext *uctx)
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