[PATCH 7.2.y] scsi: qla2xxx: Null out freed pointers in qla2x00_mem_alloc() error path

[Sasha Levin <sashal@kernel.org>]

From: Nilesh Javali <njavali@marvell.com>

[ Upstream commit 6d90f0feb929f6c0f3010f9af4747c7230b75993 ]

When qla2x00_mem_alloc() fails, qla2x00_probe_one() jumps to
probe_hw_failed and calls qla2x00_mem_free(). Several error labels in
qla2x00_mem_alloc() freed adapter members (elsrej.c, purex_dma_pool,
flt, sfp_data, loop_id_map, async_pd, sf_init_cb, ex_init_cb, npiv_info)
but left the pointers dangling. qla2x00_mem_free() then freed them a
second time. Worse, for the dma_pool members it issued
dma_pool_free(ha->s_dma_pool, ...) after s_dma_pool had already been
destroyed and set to NULL at fail_s_dma_pool, dereferencing a NULL pool.

Clear each freed pointer (and its DMA handle) in the error labels so the
subsequent qla2x00_mem_free() skips them.

Cc: stable@vger.kernel.org
Reported-by: Sashiko <sashiko-dev@google.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Link: https://patch.msgid.link/20260730155838.2119230-13-njavali@marvell.com
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>
[ adjusted cleanup context for the missing fail_flt_data block. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/qla2xxx/qla_os.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index d853b4006f4e7..e0c5732037adf 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -4484,25 +4484,40 @@ qla2x00_mem_alloc(struct qla_hw_data *ha, uint16_t req_len, uint16_t rsp_len,
 fail_lsrjt:
 	dma_free_coherent(&ha->pdev->dev, ha->elsrej.size,
 			  ha->elsrej.c, ha->elsrej.cdma);
+	ha->elsrej.c = NULL;
+	ha->elsrej.cdma = 0;
 fail_elsrej:
 	dma_pool_destroy(ha->purex_dma_pool);
+	ha->purex_dma_pool = NULL;
 fail_flt:
 	dma_free_coherent(&ha->pdev->dev, sizeof(struct qla_flt_header) + FLT_REGIONS_SIZE,
 	    ha->flt, ha->flt_dma);
+	ha->flt = NULL;
+	ha->flt_dma = 0;
 
 fail_flt_buffer:
 	dma_free_coherent(&ha->pdev->dev, SFP_DEV_SIZE,
 	    ha->sfp_data, ha->sfp_data_dma);
+	ha->sfp_data = NULL;
+	ha->sfp_data_dma = 0;
 fail_sfp_data:
 	kfree(ha->loop_id_map);
+	ha->loop_id_map = NULL;
 fail_loop_id_map:
 	dma_pool_free(ha->s_dma_pool, ha->async_pd, ha->async_pd_dma);
+	ha->async_pd = NULL;
+	ha->async_pd_dma = 0;
 fail_async_pd:
 	dma_pool_free(ha->s_dma_pool, ha->sf_init_cb, ha->sf_init_cb_dma);
+	ha->sf_init_cb = NULL;
+	ha->sf_init_cb_dma = 0;
 fail_sf_init_cb:
 	dma_pool_free(ha->s_dma_pool, ha->ex_init_cb, ha->ex_init_cb_dma);
+	ha->ex_init_cb = NULL;
+	ha->ex_init_cb_dma = 0;
 fail_ex_init_cb:
 	kfree(ha->npiv_info);
+	ha->npiv_info = NULL;
 fail_npiv_info:
 	dma_free_coherent(&ha->pdev->dev, ((*rsp)->length + 1) *
 		sizeof(response_t), (*rsp)->ring, (*rsp)->dma);
-- 
2.53.0