[PATCH] nvmem: core: return EFBIG on out-of-range write

From: Guy Shapiro
Date: Tue Aug 29 2017 - 07:37:40 EST


When writing data that exceeds the nvmem size to a nvmem sysfs file
using the sh redirection operator >, the shell hangs, trying to
write the out-of-range bytes endlessly.

Fix the problem by returning EFBIG described in man 2 write.

Similar change was done for binary sysfs files on commit
0936896056365349afa867c16e9f9100a6707cbf

Signed-off-by: Guy Shapiro <guy.shapiro@xxxxxxxxxxxxx>
Cc: linux-api@xxxxxxxxxxxxxxx
---
drivers/nvmem/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 4c49285..ae6cadd 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -135,7 +135,7 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj,

/* Stop the user from writing */
if (pos >= nvmem->size)
- return 0;
+ return -EFBIG;

if (count < nvmem->word_size)
return -EINVAL;
--
2.1.4