On Sunday, 10 June 2007 15:42, Arkadiusz Miskiewicz wrote:
> Hello,
>
> Is this desired behaviour?
Obviously not.
> $ sudo cat /dev/snapshot
>
> ended with:
>
> [54498.464550] device-mapper: ioctl: 4.11.0-ioctl (2006-10-12) initialised:
> [email protected]
> [56592.077674] swsusp: Basic memory bitmaps created
> [56592.084340] BUG: unable to handle kernel NULL pointer dereference at
> virtual address 0000000c
Can you please try the appended patch?
Rafael
Signed-off-by: Rafael J. Wysocki <[email protected]>
---
kernel/power/user.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6.22-rc4/kernel/power/user.c
===================================================================
--- linux-2.6.22-rc4.orig/kernel/power/user.c 2007-06-10 19:33:36.000000000 +0200
+++ linux-2.6.22-rc4/kernel/power/user.c 2007-06-10 19:35:59.000000000 +0200
@@ -99,6 +99,8 @@ static ssize_t snapshot_read(struct file
ssize_t res;
data = filp->private_data;
+ if (!data->ready)
+ return -ENODATA;
res = snapshot_read_next(&data->handle, count);
if (res > 0) {
if (copy_to_user(buf, data_of(data->handle), res))
@@ -163,7 +165,7 @@ static int snapshot_ioctl(struct inode *
break;
case SNAPSHOT_UNFREEZE:
- if (!data->frozen)
+ if (!data->frozen || data->ready)
break;
mutex_lock(&pm_mutex);
thaw_processes();
-
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