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RDMA/rxe: Fix an error handling path in rxe_get_mcg()

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The commit in the Fixes tag has shuffled some code.
Now 'mcg_num' is incremented before the kzalloc(). So if the memory
allocation fails, this increment must be undone.

Fixes: a926a903b7 ("RDMA/rxe: Do not call dev_mc_add/del() under a spinlock")
Link: https://lore.kernel.org/r/fe137cd8b1f17593243aa73d59c18ea71ab9ee36.1653225896.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Christophe JAILLET 2022-05-22 15:25:08 +02:00 committed by Jason Gunthorpe
parent a6f844da39
commit 7f60951ff4
1 changed files with 4 additions and 2 deletions
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6
drivers/infiniband/sw/rxe/rxe_mcast.c
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@ -206,8 +206,10 @@ static struct rxe_mcg *rxe_get_mcg(struct rxe_dev *rxe, union ib_gid *mgid)
/* speculative alloc of new mcg */
mcg = kzalloc(sizeof(*mcg), GFP_KERNEL);
if (!mcg)
return ERR_PTR(-ENOMEM);
if (!mcg) {
err = -ENOMEM;
goto err_dec;
}
spin_lock_bh(&rxe->mcg_lock);
/* re-check to see if someone else just added it */