From: Kees Cook <keescook@xxxxxxxxxxxx> Hi Kees, Jiri or Greg, This patch has been backported to 3.2 stable tree. It is a CVE bugfix, and looks applicable to stable-3.4. It prevents from triggering a NULL dereference during atrr file writing if a HID device send a malicious output report. NOTE: Rename file drivers/hid/hid-picolcd_core.c -> drivers/hid/hid-picolcd.c. =========== From: Kees Cook <keescook@xxxxxxxxxxxx> commit 1e87a2456b0227ca4ab881e19a11bb99d164e792 upstream. A HID device could send a malicious output report that would cause the picolcd HID driver to trigger a NULL dereference during attr file writing. [jkosina@xxxxxxx: changed report->maxfield < 1 to report->maxfield != 1 as suggested by Bruno]. CVE-2013-2899 Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Cc: stable@xxxxxxxxxx Reviewed-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx> Acked-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx> Signed-off-by: Jiri Kosina <jkosina@xxxxxxx> [Kefeng: backported to stable 3.4: adjust filename] Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> --- drivers/hid/hid-picolcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c index 45c3433..95f9047 100644 --- a/drivers/hid/hid-picolcd.c +++ b/drivers/hid/hid-picolcd.c @@ -1424,7 +1424,7 @@ static ssize_t picolcd_operation_mode_store(struct device *dev, buf += 10; cnt -= 10; } - if (!report) + if (!report || report->maxfield != 1) return -EINVAL; while (cnt > 0 && (buf[cnt-1] == '\n' || buf[cnt-1] == '\r')) -- 1.8.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
