This is a note to let you know that I've just added the patch titled
drivers/base: cacheinfo: validate device node for all the caches
to my driver-core git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
in the driver-core-next branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will also be merged in the next major kernel release
during the merge window.
If you have any questions about this process, please let me know.
>From 8a7d95f95c95f396decbd4cda6d4903fc4664946 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@xxxxxxx>
Date: Tue, 17 Mar 2015 17:28:46 +0000
Subject: drivers/base: cacheinfo: validate device node for all the caches
On architectures that depend on DT for obtaining cache hierarcy, we need
to validate the device node for all the cache indices, failing to do so
might result in wrong information being exposed to the userspace.
This is quite possible on initial/incomplete versions of the device
trees. In such cases, it's better to bail out if all the required device
nodes are not present.
This patch adds checks for the validation of device node for all the
caches and doesn't initialise the cacheinfo if there's any error.
Reported-by: Mark Rutland <mark.rutland@xxxxxxx>
Acked-by: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.0
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/cacheinfo.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index 6e64563361f0..9c2ba1c97c42 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -62,15 +62,21 @@ static int cache_setup_of_node(unsigned int cpu)
return -ENOENT;
}
- while (np && index < cache_leaves(cpu)) {
+ while (index < cache_leaves(cpu)) {
this_leaf = this_cpu_ci->info_list + index;
if (this_leaf->level != 1)
np = of_find_next_cache_node(np);
else
np = of_node_get(np);/* cpu node itself */
+ if (!np)
+ break;
this_leaf->of_node = np;
index++;
}
+
+ if (index != cache_leaves(cpu)) /* not all OF nodes populated */
+ return -ENOENT;
+
return 0;
}
@@ -189,8 +195,11 @@ static int detect_cache_attributes(unsigned int cpu)
* will be set up here only if they are not populated already
*/
ret = cache_shared_cpu_map_setup(cpu);
- if (ret)
+ if (ret) {
+ pr_warn("Unable to detect cache hierarcy from DT for CPU %d\n",
+ cpu);
goto free_ci;
+ }
return 0;
free_ci:
--
2.3.4
--
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