linux-kernel - [PATCH 5.4 12/24] iwlwifi: pcie: fix context info memory leak

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Message-Id: <20210211150149.054019804@linuxfoundation.org>
Date:   Thu, 11 Feb 2021 16:02:35 +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, Johannes Berg <johannes.berg@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 12/24] iwlwifi: pcie: fix context info memory leak

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit 2d6bc752cc2806366d9a4fd577b3f6c1f7a7e04e ]

If the image loader allocation fails, we leak all the previously
allocated memory. Fix this.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20210115130252.97172cbaa67c.I3473233d0ad01a71aa9400832fb2b9f494d88a11@changeid
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c  | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c b/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c
index 7a5b024a6d384..eab159205e48b 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c
@@ -164,8 +164,10 @@ int iwl_pcie_ctxt_info_gen3_init(struct iwl_trans *trans,
 	/* Allocate IML */
 	iml_img = dma_alloc_coherent(trans->dev, trans->iml_len,
 				     &trans_pcie->iml_dma_addr, GFP_KERNEL);
-	if (!iml_img)
-		return -ENOMEM;
+	if (!iml_img) {
+		ret = -ENOMEM;
+		goto err_free_ctxt_info;
+	}
 
 	memcpy(iml_img, trans->iml, trans->iml_len);
 
@@ -207,6 +209,11 @@ int iwl_pcie_ctxt_info_gen3_init(struct iwl_trans *trans,
 
 	return 0;
 
+err_free_ctxt_info:
+	dma_free_coherent(trans->dev, sizeof(*trans_pcie->ctxt_info_gen3),
+			  trans_pcie->ctxt_info_gen3,
+			  trans_pcie->ctxt_info_dma_addr);
+	trans_pcie->ctxt_info_gen3 = NULL;
 err_free_prph_info:
 	dma_free_coherent(trans->dev,
 			  sizeof(*prph_info),
-- 
2.27.0