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net: marvell: prestera: fix NULL dereference on devlink_alloc() failure

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devlink_alloc() may return NULL on allocation failure, but
prestera_devlink_alloc() unconditionally calls devlink_priv() on
the returned pointer.

This leads to a NULL pointer dereference if devlink allocation fails.
Add a check for a NULL devlink pointer and return NULL early to avoid
the crash.

Fixes: 34dd1710f5 ("net: marvell: prestera: Add basic devlink support")
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Acked-by: Elad Nachman <enachman@marvell.com>
Link: https://patch.msgid.link/20251230052124.897012-1-alok.a.tiwari@oracle.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Alok Tiwari 2025-12-29 21:21:18 -08:00 committed by Jakub Kicinski
parent dbf8fe85a1
commit a428e0da12
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/marvell/prestera/prestera_devlink.c
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@ -387,6 +387,8 @@ struct prestera_switch *prestera_devlink_alloc(struct prestera_device *dev)
dl = devlink_alloc(&prestera_dl_ops, sizeof(struct prestera_switch),
dev->dev);
if (!dl)
return NULL;
return devlink_priv(dl);
}