[PATCH 5.10.y 2/2] qed: fix double free in qed_cxt_tables_alloc()

[Sasha Levin <sashal@kernel.org>]

From: Dawei Feng <dawei.feng@seu.edu.cn>

[ Upstream commit 2bccfb8476ca5f3548afbd623dc7a6980d4e77de ]

If one of the later PF or VF CID bitmap allocations fails,
qed_cid_map_alloc() jumps to cid_map_fail and frees the previously
allocated CID bitmaps before returning an error. qed_cxt_tables_alloc()
then calls qed_cxt_mngr_free(), which invokes qed_cid_map_free()
again.

Fix this by setting each CID bitmap pointer to NULL after bitmap_free()
to avoid double free.

The bug was first flagged by an experimental analysis tool we are
developing for kernel memory-management bugs while analyzing
v6.13-rc1. The tool is still under development and is not yet publicly
available. Manual inspection confirms that the bug is still
present in v7.1-rc3.

Runtime reproduction was not attempted because exercising the failing
allocation path requires device-specific setup.

Fixes: fe56b9e6a8d9 ("qed: Add module with basic common support")
Cc: stable@vger.kernel.org
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Signed-off-by: Dawei Feng <dawei.feng@seu.edu.cn>
Link: https://patch.msgid.link/20260520070323.2762379-1-dawei.feng@seu.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/qlogic/qed/qed_cxt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_cxt.c b/drivers/net/ethernet/qlogic/qed/qed_cxt.c
index 8fc8f428266a9..2585d36b94f2f 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_cxt.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_cxt.c
@@ -1038,11 +1038,13 @@ static void qed_cid_map_free(struct qed_hwfn *p_hwfn)
 
 	for (type = 0; type < MAX_CONN_TYPES; type++) {
 		bitmap_free(p_mngr->acquired[type].cid_map);
+		p_mngr->acquired[type].cid_map = NULL;
 		p_mngr->acquired[type].max_count = 0;
 		p_mngr->acquired[type].start_cid = 0;
 
 		for (vf = 0; vf < MAX_NUM_VFS; vf++) {
 			bitmap_free(p_mngr->acquired_vf[type][vf].cid_map);
+			p_mngr->acquired_vf[type][vf].cid_map = NULL;
 			p_mngr->acquired_vf[type][vf].max_count = 0;
 			p_mngr->acquired_vf[type][vf].start_cid = 0;
 		}
-- 
2.53.0