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From:   Sasha Levin <sashal@kernel.org>
To:     stable@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Nicholas Mc Guire <hofrat@osadl.org>,
        Hans Verkuil <hans.verkuil@cisco.com>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.19 35/57] media: pci: cx23885: handle adding to list failure
Date:   Sun,  4 Nov 2018 08:51:22 -0500
Message-Id: <20181104135144.88324-35-sashal@kernel.org>
In-Reply-To: <20181104135144.88324-1-sashal@kernel.org>
References: <20181104135144.88324-1-sashal@kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Nicholas Mc Guire <hofrat@osadl.org>

[ Upstream commit c5d59528e24ad22500347b199d52b9368e686a42 ]

altera_hw_filt_init() which calls append_internal() assumes
that the node was successfully linked in while in fact it can
silently fail. So the call-site needs to set return to -ENOMEM
on append_internal() returning NULL and exit through the err path.

Fixes: 349bcf02e361 ("[media] Altera FPGA based CI driver module")

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/pci/cx23885/altera-ci.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/media/pci/cx23885/altera-ci.c b/drivers/media/pci/cx23885/altera-ci.c
index 62bc8049b320..198c05e83f5c 100644
--- a/drivers/media/pci/cx23885/altera-ci.c
+++ b/drivers/media/pci/cx23885/altera-ci.c
@@ -665,6 +665,10 @@ static int altera_hw_filt_init(struct altera_ci_config *config, int hw_filt_nr)
 		}
 
 		temp_int = append_internal(inter);
+		if (!temp_int) {
+			ret = -ENOMEM;
+			goto err;
+		}
 		inter->filts_used = 1;
 		inter->dev = config->dev;
 		inter->fpga_rw = config->fpga_rw;
@@ -699,6 +703,7 @@ static int altera_hw_filt_init(struct altera_ci_config *config, int hw_filt_nr)
 		     __func__, ret);
 
 	kfree(pid_filt);
+	kfree(inter);
 
 	return ret;
 }
@@ -733,6 +738,10 @@ int altera_ci_init(struct altera_ci_config *config, int ci_nr)
 		}
 
 		temp_int = append_internal(inter);
+		if (!temp_int) {
+			ret = -ENOMEM;
+			goto err;
+		}
 		inter->cis_used = 1;
 		inter->dev = config->dev;
 		inter->fpga_rw = config->fpga_rw;
@@ -801,6 +810,7 @@ int altera_ci_init(struct altera_ci_config *config, int ci_nr)
 	ci_dbg_print("%s: Cannot initialize CI: Error %d.\n", __func__, ret);
 
 	kfree(state);
+	kfree(inter);
 
 	return ret;
 }
-- 
2.17.1