This is a note to let you know that I've just added the patch titled
mtd: m25p80: fix allocation size
to the 3.4-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:
mtd-m25p80-fix-allocation-size.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2a4c85e77b4bd77a83382f74c99da1c388a0fab2 Mon Sep 17 00:00:00 2001
From: Brian Norris <computersforpeace@xxxxxxxxx>
Date: Wed, 24 Jul 2013 18:32:07 -0700
Subject: mtd: m25p80: fix allocation size
From: Brian Norris <computersforpeace@xxxxxxxxx>
commit 778d226a1462572b51d6777cdb1d611543410cb4 upstream.
This patch fixes two memory errors:
1. During a probe failure (in mtd_device_parse_register?) the command
buffer would not be freed.
2. The command buffer's size is determined based on the 'fast_read'
boolean, but the assignment of fast_read is made after this
allocation. Thus, the buffer may be allocated "too small".
To fix the first, just switch to the devres version of kzalloc.
To fix the second, increase MAX_CMD_SIZE unconditionally. It's not worth
saving a byte to fiddle around with the conditions here.
This problem was reported by Yuhang Wang a while back.
Signed-off-by: Brian Norris <computersforpeace@xxxxxxxxx>
Reported-by: Yuhang Wang <wangyuhang2014@xxxxxxxxx>
Reviewed-by: Sourav Poddar <sourav.poddar@xxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Qiang Huang <h.huangqiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mtd/devices/m25p80.c | 19 +++++++------------
1 file changed, 7 insertions(+), 12 deletions(-)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -71,7 +71,7 @@
/* Define max times to check status register before we give up. */
#define MAX_READY_WAIT_JIFFIES (40 * HZ) /* M25P16 specs 40s max chip erase */
-#define MAX_CMD_SIZE 5
+#define MAX_CMD_SIZE 6
#ifdef CONFIG_M25PXX_USE_FAST_READ
#define OPCODE_READ OPCODE_FAST_READ
@@ -843,14 +843,13 @@ static int __devinit m25p_probe(struct s
}
}
- flash = kzalloc(sizeof *flash, GFP_KERNEL);
+ flash = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL);
if (!flash)
return -ENOMEM;
- flash->command = kmalloc(MAX_CMD_SIZE + FAST_READ_DUMMY_BYTE, GFP_KERNEL);
- if (!flash->command) {
- kfree(flash);
+
+ flash->command = devm_kzalloc(&spi->dev, MAX_CMD_SIZE, GFP_KERNEL);
+ if (!flash->command)
return -ENOMEM;
- }
flash->spi = spi;
mutex_init(&flash->lock);
@@ -947,14 +946,10 @@ static int __devinit m25p_probe(struct s
static int __devexit m25p_remove(struct spi_device *spi)
{
struct m25p *flash = dev_get_drvdata(&spi->dev);
- int status;
/* Clean up MTD stuff. */
- status = mtd_device_unregister(&flash->mtd);
- if (status == 0) {
- kfree(flash->command);
- kfree(flash);
- }
+ mtd_device_unregister(&flash->mtd);
+
return 0;
}
Patches currently in stable-queue which might be from computersforpeace@xxxxxxxxx are
queue-3.4/mtd-m25p80-fix-allocation-size.patch
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