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authorNeilBrown <neilb@suse.de>2009-07-01 11:14:04 +1000
committerNeilBrown <neilb@suse.de>2009-07-01 11:14:04 +1000
commitb8d966efd9a46a9a35beac50cbff6e30565125ef (patch)
treed1c59125e8ee9677e8594bdc4ab223e692a87e50 /drivers/md/md.c
parent8f6c2e4b325a8e9f8f47febb2fd0ed4fae7d45a9 (diff)
downloadlinux-b8d966efd9a46a9a35beac50cbff6e30565125ef.tar.gz
md: avoid dereferencing NULL pointer when accessing suspend_* sysfs attributes.
If we try to modify one of the md/ sysfs files suspend_lo or suspend_hi when the array is not active, we dereference a NULL. Protect against that. Cc: stable@kernel.org Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 09be637d52cb..2166af8a7654 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3573,7 +3573,8 @@ suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
- if (mddev->pers->quiesce == NULL)
+ if (mddev->pers == NULL ||
+ mddev->pers->quiesce == NULL)
return -EINVAL;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;
@@ -3601,7 +3602,8 @@ suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
- if (mddev->pers->quiesce == NULL)
+ if (mddev->pers == NULL ||
+ mddev->pers->quiesce == NULL)
return -EINVAL;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;