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    Subject[PATCH 3.4 017/134] HID: validate feature and input report details
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Benjamin Tissoires <benjamin.tissoires@redhat.com>

    commit cc6b54aa54bf40b762cab45a9fc8aa81653146eb upstream.

    When dealing with usage_index, be sure to properly use unsigned instead of
    int to avoid overflows.

    When working on report fields, always validate that their report_counts are
    in bounds.
    Without this, a HID device could report a malicious feature report that
    could trick the driver into a heap overflow:

    [ 634.885003] usb 1-1: New USB device found, idVendor=0596, idProduct=0500
    ...
    [ 676.469629] BUG kmalloc-192 (Tainted: G W ): Redzone overwritten

    CVE-2013-2897

    Cc: stable@vger.kernel.org
    Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
    Acked-by: Kees Cook <keescook@chromium.org>
    Signed-off-by: Jiri Kosina <jkosina@suse.cz>
    [bwh: Backported to 3.2:
    - Drop inapplicable changes to hid_usage::usage_index initialisation and
    to hid_report_raw_event()
    - Adjust context in report_features()
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    [yijingwang: Backported to 3.4: context adjust]
    Signed-off-by: Yijing Wang <wangyijing@huawei.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/hid/hid-core.c | 9 +++++----
    drivers/hid/hid-input.c | 12 +++++++++++-
    2 files changed, 16 insertions(+), 5 deletions(-)

    --- a/drivers/hid/hid-core.c
    +++ b/drivers/hid/hid-core.c
    @@ -222,9 +222,9 @@ static int hid_add_field(struct hid_pars
    {
    struct hid_report *report;
    struct hid_field *field;
    - int usages;
    + unsigned usages;
    unsigned offset;
    - int i;
    + unsigned i;

    report = hid_register_report(parser->device, report_type, parser->global.report_id);
    if (!report) {
    @@ -244,7 +244,8 @@ static int hid_add_field(struct hid_pars
    if (!parser->local.usage_index) /* Ignore padding fields */
    return 0;

    - usages = max_t(int, parser->local.usage_index, parser->global.report_count);
    + usages = max_t(unsigned, parser->local.usage_index,
    + parser->global.report_count);

    field = hid_register_field(report, usages, parser->global.report_count);
    if (!field)
    @@ -255,7 +256,7 @@ static int hid_add_field(struct hid_pars
    field->application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION);

    for (i = 0; i < usages; i++) {
    - int j = i;
    + unsigned j = i;
    /* Duplicate the last usage we parsed if we have excess values */
    if (i >= parser->local.usage_index)
    j = parser->local.usage_index - 1;
    --- a/drivers/hid/hid-input.c
    +++ b/drivers/hid/hid-input.c
    @@ -459,6 +459,10 @@ static void hidinput_configure_usage(str
    if (field->flags & HID_MAIN_ITEM_CONSTANT)
    goto ignore;

    + /* Ignore if report count is out of bounds. */
    + if (field->report_count < 1)
    + goto ignore;
    +
    /* only LED usages are supported in output fields */
    if (field->report_type == HID_OUTPUT_REPORT &&
    (usage->hid & HID_USAGE_PAGE) != HID_UP_LED) {
    @@ -1119,7 +1123,12 @@ static void report_features(struct hid_d

    rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
    list_for_each_entry(rep, &rep_enum->report_list, list)
    - for (i = 0; i < rep->maxfield; i++)
    + for (i = 0; i < rep->maxfield; i++) {
    +
    + /* Ignore if report count is out of bounds. */
    + if (rep->field[i]->report_count < 1)
    + continue;
    +
    for (j = 0; j < rep->field[i]->maxusage; j++) {
    /* Verify if Battery Strength feature is available */
    hidinput_setup_battery(hid, HID_FEATURE_REPORT, rep->field[i]);
    @@ -1128,6 +1137,7 @@ static void report_features(struct hid_d
    drv->feature_mapping(hid, rep->field[i],
    rep->field[i]->usage + j);
    }
    + }
    }

    /*



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