IB/mlx4: Fix use-after-free on pkey sysfs registration failure

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register_pkey_tree() ignores errors from register_one_pkey_tree() and
continues registering the remaining slaves. The per-slave error path has
already released the pkey parent kobjects, but their pointers remain
stored in the device. A later device cleanup therefore passes the stale
pointers to kobject_put(), causing a use-after-free.

Clear the parent pointers after releasing a failed slave tree and skip
unregistered trees during device cleanup. This preserves the existing
best-effort registration behavior while preventing a second cleanup of
the failed tree.

Fixes: c1e7e46612 ("IB/mlx4: Add iov directory in sysfs under the ib device")
Cc: stable@vger.kernel.org
Signed-off-by: Shuangpeng Bai <shuangpeng.kernel@gmail.com>
Link: https://patch.msgid.link/20260816044510.3848996-1-shuangpeng.kernel@gmail.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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Shuangpeng Bai 2026-08-16 00:45:10 -04:00 • committed by Leon Romanovsky

parent a44a3f175e

commit 1af874e9f4

1 changed files with 4 additions and 0 deletions

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drivers/infiniband/hw/mlx4/sysfs.c

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