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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2015-12-14 09:42:38 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-07 23:09:13 -0800
commit2f9ba5b2f8420e0e5712080dafc773f7dd47c3df (patch)
tree3d63d41c671776a86dd02b4d7eca0011f158a091 /drivers/nvmem
parent7326fffb712f09a315bc73cc1ee63843f59b8bd4 (diff)
downloadlinux-2f9ba5b2f8420e0e5712080dafc773f7dd47c3df.tar.bz2
nvmem: core: return error for non word aligned access
nvmem providers have restrictions on register strides, so return error when users attempt to read/write buffers with sizes which are less than word size. Without this patch the userspace would continue to try as it does not get any error from the nvmem core, resulting in a hang or endless loop in userspace. Reported-by: Ariel D'Alessandro <ariel@vanguardiasur.com.ar> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/core.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 6fd4e5a5ef4a..9d11d9837312 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -70,6 +70,9 @@ static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj,
if (pos >= nvmem->size)
return 0;
+ if (count < nvmem->word_size)
+ return -EINVAL;
+
if (pos + count > nvmem->size)
count = nvmem->size - pos;
@@ -95,6 +98,9 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj,
if (pos >= nvmem->size)
return 0;
+ if (count < nvmem->word_size)
+ return -EINVAL;
+
if (pos + count > nvmem->size)
count = nvmem->size - pos;