From: Jack Morgenstein Date: Mon, 16 Sep 2019 07:11:54 +0000 (+0300) Subject: RDMA: Fix double-free in srq creation error flow X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3eca7fc2d8d1275d9cf0c709f0937becbfcf6d96;p=linux.git RDMA: Fix double-free in srq creation error flow The cited commit introduced a double-free of the srq buffer in the error flow of procedure __uverbs_create_xsrq(). The problem is that ib_destroy_srq_user() called in the error flow also frees the srq buffer. Thus, if uverbs_response() fails in __uverbs_create_srq(), the srq buffer will be freed twice. Cc: Fixes: 68e326dea1db ("RDMA: Handle SRQ allocations by IB/core") Link: https://lore.kernel.org/r/20190916071154.20383-5-leon@kernel.org Signed-off-by: Jack Morgenstein Signed-off-by: Leon Romanovsky Reviewed-by: Jason Gunthorpe Signed-off-by: Jason Gunthorpe --- diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index 8f4fd4fac1593..13af88da5f792 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -3482,7 +3482,8 @@ static int __uverbs_create_xsrq(struct uverbs_attr_bundle *attrs, err_copy: ib_destroy_srq_user(srq, uverbs_get_cleared_udata(attrs)); - + /* It was released in ib_destroy_srq_user */ + srq = NULL; err_free: kfree(srq); err_put: