linux-kernel - [PATCH 1/4] nvmem: core: return EFBIG on out-of-range write

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Date:   Mon, 11 Sep 2017 11:00:11 +0200
From:   srinivas.kandagatla@...aro.org
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Guy Shapiro <guy.shapiro@...i-wize.com>,
        linux-api@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 1/4] nvmem: core: return EFBIG on out-of-range write

From: Guy Shapiro <guy.shapiro@...i-wize.com>

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@...i-wize.com>
Cc: linux-api@...r.kernel.org
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 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 de54c7f..3866117 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;
-- 
2.9.3