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Groups > linux.kernel > #1649029

[PATCH 8/8] firmware: vpd: fix confusion between memremap and iounmap

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We should not be using iounmap to unmap memory mapped with memremap.

This fixes following warnings generated by sparse in response to
incorrect type annotations:

  CHECK   drivers/firmware/google/vpd.c
drivers/firmware/google/vpd.c:235:20: warning: incorrect type in argument 1 (different address spaces)
drivers/firmware/google/vpd.c:235:20:    expected void volatile [noderef] <asn:2>*addr
drivers/firmware/google/vpd.c:235:20:    got char *baseaddr
drivers/firmware/google/vpd.c:246:28: warning: incorrect type in argument 1 (different address spaces)
drivers/firmware/google/vpd.c:246:28:    expected void volatile [noderef] <asn:2>*addr
drivers/firmware/google/vpd.c:246:28:    got char *baseaddr
drivers/firmware/google/vpd.c:258:14: warning: incorrect type in assignment (different address spaces)
drivers/firmware/google/vpd.c:258:14:    expected struct vpd_cbmem [noderef] <asn:2>*temp
drivers/firmware/google/vpd.c:258:14:    got void *

Fixes: 049a59db34eb ("firmware: Google VPD sysfs driver")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/firmware/google/vpd.c | 39 ++++++++++++++++++++-------------------
 1 file changed, 20 insertions(+), 19 deletions(-)

diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c
index f4766bf6785a..b076210e38a2 100644
--- a/drivers/firmware/google/vpd.c
+++ b/drivers/firmware/google/vpd.c
@@ -200,7 +200,7 @@ static int vpd_section_init(const char *name, struct vpd_section *sec,
 	sec->raw_name = kasprintf(GFP_KERNEL, "%s_raw", name);
 	if (!sec->raw_name) {
 		err = -ENOMEM;
-		goto err_iounmap;
+		goto err_unmap;
 	}
 
 	sysfs_bin_attr_init(&sec->bin_attr);
@@ -231,8 +231,8 @@ static int vpd_section_init(const char *name, struct vpd_section *sec,
 	sysfs_remove_bin_file(vpd_kobj, &sec->bin_attr);
 err_free_raw_name:
 	kfree(sec->raw_name);
-err_iounmap:
-	iounmap(sec->baseaddr);
+err_unmap:
+	memunmap(sec->baseaddr);
 	return err;
 }
 
@@ -243,7 +243,7 @@ static int vpd_section_destroy(struct vpd_section *sec)
 		kobject_put(sec->kobj);
 		sysfs_remove_bin_file(vpd_kobj, &sec->bin_attr);
 		kfree(sec->raw_name);
-		iounmap(sec->baseaddr);
+		memunmap(sec->baseaddr);
 	}
 
 	return 0;
@@ -251,38 +251,39 @@ static int vpd_section_destroy(struct vpd_section *sec)
 
 static int vpd_sections_init(phys_addr_t physaddr)
 {
-	struct vpd_cbmem __iomem *temp;
-	struct vpd_cbmem header;
+	struct vpd_cbmem *header;
 	int ret = 0;
 
-	temp = memremap(physaddr, sizeof(struct vpd_cbmem), MEMREMAP_WB);
-	if (!temp)
+	header = memremap(physaddr, sizeof(struct vpd_cbmem), MEMREMAP_WB);
+	if (!header)
 		return -ENOMEM;
 
-	memcpy_fromio(&header, temp, sizeof(struct vpd_cbmem));
-	iounmap(temp);
-
-	if (header.magic != VPD_CBMEM_MAGIC)
-		return -ENODEV;
+	if (header->magic != VPD_CBMEM_MAGIC) {
+		ret = -ENODEV;
+		goto out;
+	}
 
-	if (header.ro_size) {
+	if (header->ro_size) {
 		ret = vpd_section_init("ro", &ro_vpd,
 				       physaddr + sizeof(struct vpd_cbmem),
-				       header.ro_size);
+				       header->ro_size);
 		if (ret)
-			return ret;
+			goto out;
 	}
 
-	if (header.rw_size) {
+	if (header->rw_size) {
 		ret = vpd_section_init("rw", &rw_vpd,
 				       physaddr + sizeof(struct vpd_cbmem) +
-				       header.ro_size, header.rw_size);
+						header->ro_size,
+				       header->rw_size);
 		if (ret) {
 			vpd_section_destroy(&ro_vpd);
-			return ret;
+			goto out;
 		}
 	}
 
+out:
+	memunmap(header);
 	return 0;
 }
 
-- 
2.13.0.219.gdb65acc882-goog

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Thread

[PATCH 1/8] firmware: vpd: do not leave freed section attributes to the list Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-05-24 02:10 +0200
  [PATCH 7/8] firmware: vpd: remove platform driver Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-05-24 02:10 +0200
    Re: [PATCH 7/8] firmware: vpd: remove platform driver Guenter Roeck <groeck@google.com> - 2017-05-24 19:30 +0200
  [PATCH 2/8] firmware: vpd: use kdtrndup when copying section key Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-05-24 02:10 +0200
    Re: [PATCH 2/8] firmware: vpd: use kdtrndup when copying section key Guenter Roeck <groeck@google.com> - 2017-05-24 19:20 +0200
  [PATCH 4/8] firmware: vpd: do not leak kobjects Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-05-24 02:10 +0200
    Re: [PATCH 4/8] firmware: vpd: do not leak kobjects Guenter Roeck <groeck@google.com> - 2017-05-24 19:20 +0200
  [PATCH 5/8] firmware: vpd: use kasprintf() when forming name of 'raw' attribute Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-05-24 02:10 +0200
    Re: [PATCH 5/8] firmware: vpd: use kasprintf() when forming name of  'raw' attribute Guenter Roeck <groeck@google.com> - 2017-05-24 19:20 +0200
  [PATCH 8/8] firmware: vpd: fix confusion between memremap and iounmap Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-05-24 02:10 +0200
  [PATCH 3/8] firmware: vpd: avoid potential use-after-free when destroying section Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2017-05-24 02:20 +0200
    Re: [PATCH 3/8] firmware: vpd: avoid potential use-after-free when  destroying section Guenter Roeck <groeck@google.com> - 2017-05-24 19:20 +0200

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