linux-kernel - [PATCH v2] firmware: vpd: Fix section enabled flag on vpd_section

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Date:   Tue, 24 Jul 2018 18:10:38 +0300
From:   Anton Vasilyev <vasilyev@...ras.ru>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Anton Vasilyev <vasilyev@...ras.ru>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Samuel Holland <samuel@...lland.org>,
        Pan Bian <bianpan2016@....com>, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH v2] firmware: vpd: Fix section enabled flag on vpd_section_destroy

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>
---
v2: add cleanup on the error path of vpd_sections_init
---
 drivers/firmware/google/vpd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c
index e9db895916c3..1aa67bb5d8c0 100644
--- a/drivers/firmware/google/vpd.c
+++ b/drivers/firmware/google/vpd.c
@@ -246,6 +246,7 @@ static int vpd_section_destroy(struct vpd_section *sec)
 		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 physaddr)
 		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;
-- 
2.18.0