Re: [PATCH] device property: Fix the length used in PROPERTY_ENTRY_STRING

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

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On Sat, Jan 26, 2019 at 04:09:45PM +0000, Sasha Levin wrote:
> Hi,
> 
> [This is an automated email]
> 
> This commit has been processed because it contains a "Fixes:" tag,
> fixing commit: a85f42047533 device property: helper macros for property entry creation.
> 
> The bot has tested the following trees: v4.20.4, v4.19.17, v4.14.95, v4.9.152.
> 
> v4.20.4: Build OK!
> v4.19.17: Build OK!
> v4.14.95: Failed to apply! Possible dependencies:
>     63dcc7090137 ("device property: Get rid of union aliasing")
>     6e98503dba64 ("efi/apple-properties: Remove redundant attribute initialization from unmarshal_key_value_pairs()")
>     b2ca8bdff60c ("device property: Reuse property_entry_free_data()")
>     d5f962fa269e ("device property: Move property_entry_free_data() upper")
> 
> v4.9.152: Failed to apply! Possible dependencies:
>     027b25b26447 ("ACPI: Add FWNODE_ACPI_STATIC fwnode type")
>     07bb80d40b0e ("device property: Add support for remote endpoints")
>     0f194992c85f ("device property: Fix reading pset strings using array access functions")
>     1df09bc66f9b ("of: Move OF property and graph API from base.c to property.c")
>     21ea73f54c6d ("device property: Add fwnode_get_named_child_node()")
>     2475a2b6c877 ("drivers/of/base.c: Add of_property_read_u64_index")
>     2bd5452d46df ("device property: Add support for fwnode endpoints")
>     34055190b19d ("ACPI / property: Add fwnode_get_next_child_node()")
>     3708184afc77 ("device property: Move FW type specific functionality to FW specific files")
>     39e5aeed835d ("device property: Constify argument to pset fwnode backend")
>     3b27d00e7b6d ("device property: Move fwnode graph ops to firmware specific locations")
>     5fa23530d4fc ("of: base: add support to find the level of the last cache")
>     63dcc7090137 ("device property: Get rid of union aliasing")
>     79389a83bc38 ("ACPI / property: Add support for remote endpoints")
>     99db5ff7fe0b ("ACPI / property: Hierarchical properties support update")
>     afaf26fd8458 ("device property: Add fwnode_get_parent()")
>     b85ad494098b ("of: introduce of_graph_get_remote_node")
>     bec84da8d1da ("device property: allow to constify properties")
>     db3e50f3234b ("device property: Get rid of struct fwnode_handle type field")
>     dfa672fbc0d9 ("ACPI / property: Add possiblity to retrieve parent firmware node")
>     e7887c284969 ("device property: Add fwnode_handle_get()")
> 
> 
> How should we proceed with this patch?

Can we use the attached separate patches with v4.9 and v4.14 ?

thanks,

-- 
heikki

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From 6bd60b922b1f1e43fd534a11194553f27c036a1e Mon Sep 17 00:00:00 2001
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Date: Wed, 23 Jan 2019 17:16:47 +0300
Subject: [PATCH] device property: Fix the length used in PROPERTY_ENTRY_STRING

With string type property entries we need to use
sizeof(const char *) instead of the number of characters as
the length of the entry.

If the string was shorter then sizeof(const char *),
attempts to read it would have failed with -EOVERFLOW. The
problem has been hidden because all build-in string
properties have had a string longer then 8 characters until
now.

Fixes: a85f42047533 ("device property: helper macros for property entry creation")
Cc: stable@vger.kernel.org # 4.9.x
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 include/linux/property.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/property.h b/include/linux/property.h
index 459337fb44d0..d5c7ebda4113 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -233,7 +233,7 @@ struct property_entry {
 #define PROPERTY_ENTRY_STRING(_name_, _val_)		\
 (struct property_entry) {				\
 	.name = _name_,					\
-	.length = sizeof(_val_),			\
+	.length = sizeof(const char *),			\
 	.is_string = true,				\
 	{ .value = { .str = _val_ } },			\
 }
-- 
2.20.1


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From 9ebe90b6f12d4107e8b7c3949a924486d311e28f Mon Sep 17 00:00:00 2001
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Date: Wed, 23 Jan 2019 17:16:47 +0300
Subject: [PATCH] device property: Fix the length used in PROPERTY_ENTRY_STRING

With string type property entries we need to use
sizeof(const char *) instead of the number of characters as
the length of the entry.

If the string was shorter then sizeof(const char *),
attempts to read it would have failed with -EOVERFLOW. The
problem has been hidden because all build-in string
properties have had a string longer then 8 characters until
now.

Fixes: a85f42047533 ("device property: helper macros for property entry creation")
Cc: stable@vger.kernel.org # 4.14.x
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 include/linux/property.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/property.h b/include/linux/property.h
index 89d94b349912..45777ec1c524 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -252,7 +252,7 @@ struct property_entry {
 #define PROPERTY_ENTRY_STRING(_name_, _val_)		\
 (struct property_entry) {				\
 	.name = _name_,					\
-	.length = sizeof(_val_),			\
+	.length = sizeof(const char *),			\
 	.is_string = true,				\
 	{ .value = { .str = _val_ } },			\
 }
-- 
2.20.1