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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2015-11-17 12:12:41 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-08 10:07:21 +0300
commit313a72ff983cc2e00ac4dcb791d40ebf2f9d5718 (patch)
treee4031aac8cd831d5e737acc4f52ca56f73ddabdb /drivers/nvmem
parent4c7e4fe3776693ee4554ca1b3a2c728c1f8f361a (diff)
downloadlinux-313a72ff983cc2e00ac4dcb791d40ebf2f9d5718.tar.xz
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;