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authorJiri Kosina <jkosina@suse.cz>2012-04-27 00:56:08 +0200
committerMandar Padmawar <mpadmawar@nvidia.com>2014-06-25 00:49:27 -0700
commit056eeacaf7d96ba737377f397b4104c5e518a992 (patch)
tree8361cbc3d3c0571b945e771b0adfdc929defd825
parente394d7c715114de81e12c94f2cf92ce671d77c96 (diff)
HID: hidraw: add proper error handling to raw event reporting
If kmemdup() in hidraw_report_event() fails, we are not propagating this fact properly. Let hidraw_report_event() and hid_report_raw_event() return an error value to the caller. Reported-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz> (cherry picked from commit b6787242f32700377d3da3b8d788ab3928bab849) Change-Id: I4594eedebe423f1f8d6ff5272ab7b5bc4c924593 Signed-off-by: Jean Huang <jeanh@nvidia.com> Reviewed-on: http://git-master/r/427998 GVS: Gerrit_Virtual_Submit
-rw-r--r--drivers/hid/hid-core.c16
-rw-r--r--drivers/hid/hidraw.c19
-rw-r--r--include/linux/hidraw.h4
3 files changed, 26 insertions, 13 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 70e5b3f31e78..dae82d772816 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1032,7 +1032,7 @@ static struct hid_report *hid_get_report(struct hid_report_enum *report_enum,
return report;
}
-void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
+int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
int interrupt)
{
struct hid_report_enum *report_enum = hid->report_enum + type;
@@ -1040,10 +1040,11 @@ void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
unsigned int a;
int rsize, csize = size;
u8 *cdata = data;
+ int ret = 0;
report = hid_get_report(report_enum, data);
if (!report)
- return;
+ goto out;
if (report_enum->numbered) {
cdata++;
@@ -1063,14 +1064,19 @@ void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event)
hid->hiddev_report_event(hid, report);
- if (hid->claimed & HID_CLAIMED_HIDRAW)
- hidraw_report_event(hid, data, size);
+ if (hid->claimed & HID_CLAIMED_HIDRAW) {
+ ret = hidraw_report_event(hid, data, size);
+ if (ret)
+ goto out;
+ }
for (a = 0; a < report->maxfield; a++)
hid_input_field(hid, report->field[a], cdata, interrupt);
if (hid->claimed & HID_CLAIMED_INPUT)
hidinput_report_event(hid, report);
+out:
+ return ret;
}
EXPORT_SYMBOL_GPL(hid_report_raw_event);
@@ -1147,7 +1153,7 @@ nomem:
}
}
- hid_report_raw_event(hid, type, data, size, interrupt);
+ ret = hid_report_raw_event(hid, type, data, size, interrupt);
unlock:
up(&hid->driver_lock);
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index cf7d6d58e79f..36fa77b40ffb 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -87,11 +87,13 @@ static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count,
len = list->buffer[list->tail].len > count ?
count : list->buffer[list->tail].len;
- if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
- ret = -EFAULT;
- goto out;
+ if (list->buffer[list->tail].value) {
+ if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ ret = len;
}
- ret = len;
kfree(list->buffer[list->tail].value);
list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
@@ -437,19 +439,24 @@ static const struct file_operations hidraw_ops = {
.llseek = noop_llseek,
};
-void hidraw_report_event(struct hid_device *hid, u8 *data, int len)
+int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
{
struct hidraw *dev = hid->hidraw;
struct hidraw_list *list;
+ int ret = 0;
list_for_each_entry(list, &dev->list, node) {
- list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
+ if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
+ ret = -ENOMEM;
+ break;
+ }
list->buffer[list->head].len = len;
list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
kill_fasync(&list->fasync, SIGIO, POLL_IN);
}
wake_up_interruptible(&dev->wait);
+ return ret;
}
EXPORT_SYMBOL_GPL(hidraw_report_event);
diff --git a/include/linux/hidraw.h b/include/linux/hidraw.h
index 4b88e697c4e9..9cdc9b67ff49 100644
--- a/include/linux/hidraw.h
+++ b/include/linux/hidraw.h
@@ -76,13 +76,13 @@ struct hidraw_list {
#ifdef CONFIG_HIDRAW
int hidraw_init(void);
void hidraw_exit(void);
-void hidraw_report_event(struct hid_device *, u8 *, int);
+int hidraw_report_event(struct hid_device *, u8 *, int);
int hidraw_connect(struct hid_device *);
void hidraw_disconnect(struct hid_device *);
#else
static inline int hidraw_init(void) { return 0; }
static inline void hidraw_exit(void) { }
-static inline void hidraw_report_event(struct hid_device *hid, u8 *data, int len) { }
+static inline int hidraw_report_event(struct hid_device *hid, u8 *data, int len) { }
static inline int hidraw_connect(struct hid_device *hid) { return -1; }
static inline void hidraw_disconnect(struct hid_device *hid) { }
#endif