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authorBruno Prémont <bonbons@linux-vserver.org>2010-03-15 19:00:27 +0100
committerJiri Kosina <jkosina@suse.cz>2010-03-16 13:36:01 +0100
commite639ba481b76e445df354acd6e29d859a9b1657f (patch)
tree5c10ca02dfff40acb1dc5c1915669a8c31e818a9 /drivers/hid/hid-debug.c
parent3ee8f0a2b1c81f0472b25d40aa5c1c7c6a0edc2a (diff)
downloadlinux-e639ba481b76e445df354acd6e29d859a9b1657f.tar.bz2
HID: avoid '\0' in hid debugfs events file
When dumping /sys/kernel/debug/hid/$device/events '\0' characters show up (invisible if cat to console but shown by less or while looking at a dump file). These are due to hid_debug_event() adding strlen()+1 bytes to the ring buffer (e.g. including the trailing '\0'). Any roll-over causes a '\0' as well as hid_debug_event() handles the ring buffers with HID_DEBUG_BUFSIZE-1 size while hid_debug_events_read() handles it with full HID_DEBUG_BUFSIZE size. Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-debug.c')
-rw-r--r--drivers/hid/hid-debug.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
index cd4ece6fdfb9..0c4e75573186 100644
--- a/drivers/hid/hid-debug.c
+++ b/drivers/hid/hid-debug.c
@@ -564,10 +564,10 @@ void hid_debug_event(struct hid_device *hdev, char *buf)
struct hid_debug_list *list;
list_for_each_entry(list, &hdev->debug_list, node) {
- for (i = 0; i <= strlen(buf); i++)
- list->hid_debug_buf[(list->tail + i) % (HID_DEBUG_BUFSIZE - 1)] =
+ for (i = 0; i < strlen(buf); i++)
+ list->hid_debug_buf[(list->tail + i) % HID_DEBUG_BUFSIZE] =
buf[i];
- list->tail = (list->tail + i) % (HID_DEBUG_BUFSIZE - 1);
+ list->tail = (list->tail + i) % HID_DEBUG_BUFSIZE;
}
}
EXPORT_SYMBOL_GPL(hid_debug_event);