linux-kernel - [PATCH 5.15 12/42] RDMA/irdma: Fix a user-after-free in add_pble

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Date:   Wed, 15 Dec 2021 18:20:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 12/42] RDMA/irdma: Fix a user-after-free in add_pble_prm

From: Shiraz Saleem <shiraz.saleem@...el.com>

[ Upstream commit 1e11a39a82e95ce86f849f40dda0d9c0498cebd9 ]

When irdma_hmc_sd_one fails, 'chunk' is freed while its still on the PBLE
info list.

Add the chunk entry to the PBLE info list only after successful setting of
the SD in irdma_hmc_sd_one.

Fixes: e8c4dbc2fcac ("RDMA/irdma: Add PBLE resource manager")
Link: https://lore.kernel.org/r/20211207152135.2192-1-shiraz.saleem@intel.com
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@...el.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/hw/irdma/pble.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/irdma/pble.c b/drivers/infiniband/hw/irdma/pble.c
index aeeb1c310965d..da032b952755e 100644
--- a/drivers/infiniband/hw/irdma/pble.c
+++ b/drivers/infiniband/hw/irdma/pble.c
@@ -283,7 +283,6 @@ add_pble_prm(struct irdma_hmc_pble_rsrc *pble_rsrc)
 		  "PBLE: next_fpm_addr = %llx chunk_size[%llu] = 0x%llx\n",
 		  pble_rsrc->next_fpm_addr, chunk->size, chunk->size);
 	pble_rsrc->unallocated_pble -= (u32)(chunk->size >> 3);
-	list_add(&chunk->list, &pble_rsrc->pinfo.clist);
 	sd_reg_val = (sd_entry_type == IRDMA_SD_TYPE_PAGED) ?
 			     sd_entry->u.pd_table.pd_page_addr.pa :
 			     sd_entry->u.bp.addr.pa;
@@ -295,6 +294,7 @@ add_pble_prm(struct irdma_hmc_pble_rsrc *pble_rsrc)
 			goto error;
 	}
 
+	list_add(&chunk->list, &pble_rsrc->pinfo.clist);
 	sd_entry->valid = true;
 	return 0;
 
-- 
2.33.0