linux-kernel - [PATCH 4.18 071/158] firmware: vpd: Fix section enabled flag on vpd_section

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Message-Id: <20180917211714.530065667@linuxfoundation.org>
Date:   Tue, 18 Sep 2018 00:41:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Anton Vasilyev <vasilyev@...ras.ru>,
        Guenter Roeck <linux@...ck-us.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 071/158] firmware: vpd: Fix section enabled flag on vpd_section_destroy

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anton Vasilyev <vasilyev@...ras.ru>

[ Upstream commit 45ca3f76de0507ecf143f770570af2942f263812 ]

static struct ro_vpd and rw_vpd are initialized by vpd_sections_init()
in vpd_probe() based on header's ro and rw sizes.
In vpd_remove() vpd_section_destroy() performs deinitialization based
on enabled flag, which is set to true by vpd_sections_init().
This leads to call of vpd_section_destroy() on already destroyed section
for probe-release-probe-release sequence if first probe performs
ro_vpd initialization and second probe does not initialize it.

The patch adds changing enabled flag on vpd_section_destroy and adds
cleanup on the error path of vpd_sections_init.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@...ras.ru>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/firmware/google/vpd.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/firmware/google/vpd.c
+++ b/drivers/firmware/google/vpd.c
@@ -246,6 +246,7 @@ static int vpd_section_destroy(struct vp
 		sysfs_remove_bin_file(vpd_kobj, &sec->bin_attr);
 		kfree(sec->raw_name);
 		memunmap(sec->baseaddr);
+		sec->enabled = false;
 	}

 	return 0;
@@ -279,8 +280,10 @@ static int vpd_sections_init(phys_addr_t
 		ret = vpd_section_init("rw", &rw_vpd,
 				       physaddr + sizeof(struct vpd_cbmem) +
 				       header.ro_size, header.rw_size);
-		if (ret)
+		if (ret) {
+			vpd_section_destroy(&ro_vpd);
 			return ret;
+		}
 	}

 	return 0;