[PATCH v2] firmware: vpd: Fix section enabled flag on vpd_section_destroy

From: Anton Vasilyev
Date: Tue Jul 24 2018 - 11:11:45 EST


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@xxxxxxxxx>
---
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