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 the 3.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drivers-base-cacheinfo-validate-device-node-for-all-the-caches.patch and it can be found in the queue-3.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >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 From: Sudeep Holla <sudeep.holla@xxxxxxx> commit 8a7d95f95c95f396decbd4cda6d4903fc4664946 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/base/cacheinfo.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) --- a/drivers/base/cacheinfo.c +++ b/drivers/base/cacheinfo.c @@ -62,15 +62,21 @@ static int cache_setup_of_node(unsigned 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(unsig * 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: Patches currently in stable-queue which might be from sudeep.holla@xxxxxxx are queue-3.19/drivers-base-cacheinfo-validate-device-node-for-all-the-caches.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html