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| author |   Johan Korsnes <jkorsnes@cisco.com> | 2020-01-17 13:08:35 +0100 |
|---|---|---|
| committer |   Jiri Kosina <jkosina@suse.cz> | 2020-02-12 14:18:33 +0100 |
| commit | 5ebdffd25098898aff1249ae2f7dbfddd76d8f8f (patch) | |
| tree | 3122478a9f65b327ac83bd0cf911951719f0ca5f /drivers/hid | |
| parent | HID: apple: Add support for recent firmware on Magic Keyboards (diff) | |
| download | linux-dev-5ebdffd25098898aff1249ae2f7dbfddd76d8f8f.tar.xz linux-dev-5ebdffd25098898aff1249ae2f7dbfddd76d8f8f.zip | |
HID: core: fix off-by-one memset in hid_report_raw_event()
In case a report is greater than HID_MAX_BUFFER_SIZE, it is truncated,
but the report-number byte is not correctly handled. This results in a
off-by-one in the following memset, causing a kernel Oops and ensuing
system crash.
Note: With commit 8ec321e96e05 ("HID: Fix slab-out-of-bounds read in
hid_field_extract") I no longer hit the kernel Oops as we instead fail
"controlled" at probe if there is a report too long in the HID
report-descriptor. hid_report_raw_event() is an exported symbol, so
presumabely we cannot always rely on this being the case.
Fixes: 966922f26c7f ("HID: fix a crash in hid_report_raw_event()
function.")
Signed-off-by: Johan Korsnes <jkorsnes@cisco.com>
Cc: Armando Visconti <armando.visconti@st.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 851fe54ea59e..359616e3efbb 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1741,7 +1741,9 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size, rsize = ((report->size - 1) >> 3) + 1; - if (rsize > HID_MAX_BUFFER_SIZE) + if (report_enum->numbered && rsize >= HID_MAX_BUFFER_SIZE) + rsize = HID_MAX_BUFFER_SIZE - 1; + else if (rsize > HID_MAX_BUFFER_SIZE) rsize = HID_MAX_BUFFER_SIZE; if (csize < rsize) { |