[SRU][Q:linux-azure][PATCH 3/4] net/mana: Null service_wq on setup error to prevent double destroy

[John Cabaj]

From: Shiraz Saleem <shirazsaleem at microsoft.com>

BugLink: https://bugs.launchpad.net/bugs/2146588

In mana_gd_setup() error path, set gc->service_wq to NULL after
destroy_workqueue() to match the cleanup in mana_gd_cleanup().
This prevents a use-after-free if the workqueue pointer is checked
after a failed setup.

Fixes: f975a0955276 ("net: mana: Fix double destroy_workqueue on service rescan PCI path")
Signed-off-by: Shiraz Saleem <shirazsaleem at microsoft.com>
Signed-off-by: Konstantin Taranov <kotaranov at microsoft.com>
Reviewed-by: Simon Horman <horms at kernel.org>
Link: https://patch.msgid.link/20260309172443.688392-1-kotaranov@linux.microsoft.com
Signed-off-by: Jakub Kicinski <kuba at kernel.org>
(cherry picked from commit 87c2302813abc55c46485711a678e3c312b00666)
Signed-off-by: John Cabaj <john.cabaj at canonical.com>
---
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index da4f82433bb0..829a7d98fa41 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -1938,6 +1938,7 @@ static int mana_gd_setup(struct pci_dev *pdev)
 	mana_gd_remove_irqs(pdev);
 free_workqueue:
 	destroy_workqueue(gc->service_wq);
+	gc->service_wq = NULL;
 	dev_err(&pdev->dev, "%s failed (error %d)\n", __func__, err);
 	return err;
 }
-- 
2.43.0