linux-kernel - [PATCH 3.18 08/12] eeprom: at24: check at24

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Message-Id: <20171204155916.817496848@linuxfoundation.org>
Date:   Mon,  4 Dec 2017 16:59:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: [PATCH 3.18 08/12] eeprom: at24: check at24_read/write arguments

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Heiner Kallweit <hkallweit1@...il.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@...il.com>
Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -274,6 +274,9 @@ 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.
@@ -328,6 +331,9 @@ static ssize_t at24_eeprom_write(struct
 	unsigned long timeout, write_time;
 	unsigned next_page;
 
+	if (offset + count > at24->chip.byte_len)
+		return -EINVAL;
+
 	/* Get corresponding I2C address and adjust offset */
 	client = at24_translate_offset(at24, &offset);