This is a note to let you know that I've just added the patch titled
[PATCH 059/135] s390/cio: fix measurement characteristics memleak
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:
0059-s390-cio-fix-measurement-characteristics-memleak.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@xxxxxxxxxxxxxxx> know about it.
>From b25aac2e34a9783d2fde366d9ce12a8c0d525f50 Mon Sep 17 00:00:00 2001
From: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
Date: Mon, 25 Jan 2016 10:30:27 +0100
Subject: [PATCH 059/135] s390/cio: fix measurement characteristics memleak
[ Upstream commit 0d9bfe9123cfde59bf5c2e375b59d2a7d5061c4c ]
Measurement characteristics are allocated during channel path
registration but not freed during deregistration. Fix this by
embedding these characteristics inside struct channel_path.
Signed-off-by: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Peter Oberparleiter <oberpar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/s390/cio/chp.c | 6 +++---
drivers/s390/cio/chp.h | 2 +-
drivers/s390/cio/chsc.c | 16 ++--------------
3 files changed, 6 insertions(+), 18 deletions(-)
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -139,11 +139,11 @@ static ssize_t chp_measurement_chars_rea
device = container_of(kobj, struct device, kobj);
chp = to_channelpath(device);
- if (!chp->cmg_chars)
+ if (chp->cmg == -1)
return 0;
- return memory_read_from_buffer(buf, count, &off,
- chp->cmg_chars, sizeof(struct cmg_chars));
+ return memory_read_from_buffer(buf, count, &off, &chp->cmg_chars,
+ sizeof(chp->cmg_chars));
}
static struct bin_attribute chp_measurement_chars_attr = {
--- a/drivers/s390/cio/chp.h
+++ b/drivers/s390/cio/chp.h
@@ -48,7 +48,7 @@ struct channel_path {
/* Channel-measurement related stuff: */
int cmg;
int shared;
- void *cmg_chars;
+ struct cmg_chars cmg_chars;
};
/* Return channel_path struct for given chpid. */
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -967,22 +967,19 @@ static void
chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
struct cmg_chars *chars)
{
- struct cmg_chars *cmg_chars;
int i, mask;
- cmg_chars = chp->cmg_chars;
for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
mask = 0x80 >> (i + 3);
if (cmcv & mask)
- cmg_chars->values[i] = chars->values[i];
+ chp->cmg_chars.values[i] = chars->values[i];
else
- cmg_chars->values[i] = 0;
+ chp->cmg_chars.values[i] = 0;
}
}
int chsc_get_channel_measurement_chars(struct channel_path *chp)
{
- struct cmg_chars *cmg_chars;
int ccode, ret;
struct {
@@ -1006,11 +1003,6 @@ int chsc_get_channel_measurement_chars(s
u32 data[NR_MEASUREMENT_CHARS];
} __attribute__ ((packed)) *scmc_area;
- chp->cmg_chars = NULL;
- cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
- if (!cmg_chars)
- return -ENOMEM;
-
spin_lock_irq(&chsc_page_lock);
memset(chsc_page, 0, PAGE_SIZE);
scmc_area = chsc_page;
@@ -1042,14 +1034,10 @@ int chsc_get_channel_measurement_chars(s
/* No cmg-dependent data. */
goto out;
}
- chp->cmg_chars = cmg_chars;
chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
(struct cmg_chars *) &scmc_area->data);
out:
spin_unlock_irq(&chsc_page_lock);
- if (!chp->cmg_chars)
- kfree(cmg_chars);
-
return ret;
}
Patches currently in stable-queue which might be from sebott@xxxxxxxxxxxxxxxxxx are
queue-4.4/0059-s390-cio-fix-measurement-characteristics-memleak.patch
queue-4.4/0061-s390-cio-update-measurement-characteristics.patch
queue-4.4/0094-s390-pci_dma-fix-DMA-table-corruption-with-4-TB-main.patch
queue-4.4/0060-s390-cio-ensure-consistent-measurement-state.patch
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