Patch "eeprom: at24: check at24_read/write arguments" has been added to the 4.4-stable tree

Patch "eeprom: at24: check at24_read/write arguments" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    eeprom: at24: check at24_read/write arguments

to the 4.4-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:
     eeprom-at24-check-at24_read-write-arguments.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d9bcd462daf34aebb8de9ad7f76de0198bb5a0f0 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Fri, 24 Nov 2017 07:47:50 +0100
Subject: eeprom: at24: check at24_read/write arguments

From: Heiner Kallweit <hkallweit1@gmail.com>

commit d9bcd462daf34aebb8de9ad7f76de0198bb5a0f0 upstream.

So far we completely rely on the caller to provide valid arguments.
To be on the safe side perform an own sanity check.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/misc/eeprom/at24.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -257,6 +257,9 @@ static ssize_t at24_read(struct at24_dat
 	if (unlikely(!count))
 		return count;
 
+	if (off + count > at24->chip.byte_len)
+		return -EINVAL;
+
 	/*
 	 * Read data from chip, protecting against concurrent updates
 	 * from this host, but not from other I2C masters.
@@ -311,6 +314,9 @@ static ssize_t at24_eeprom_write(struct
 	unsigned long timeout, write_time;
 	unsigned next_page;
 
+	if (off + count > at24->chip.byte_len)
+		return -EINVAL;
+
 	/* Get corresponding I2C address and adjust offset */
 	client = at24_translate_offset(at24, &offset);
 


Patches currently in stable-queue which might be from hkallweit1@gmail.com are

queue-4.4/eeprom-at24-check-at24_read-write-arguments.patch