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* [PATCH] HID: core: detect and skip invalid inputs to snto32()
@ 2020-12-17  1:12 Randy Dunlap
  2021-01-08 13:52 ` Jiri Kosina
  0 siblings, 1 reply; 2+ messages in thread
From: Randy Dunlap @ 2020-12-17  1:12 UTC (permalink / raw)
  To: linux-kernel
  Cc: Randy Dunlap, syzbot+1e911ad71dd4ea72e04a, Jiri Kosina,
	Benjamin Tissoires, linux-input

Prevent invalid (0, 0) inputs to hid-core's snto32() function.

Maybe it is just the dummy device here that is causing this, but
there are hundreds of calls to snto32(0, 0). Having n (bits count)
of 0 is causing the current UBSAN trap with a shift value of
0xffffffff (-1, or n - 1 in this function).

Either of the value to shift being 0 or the bits count being 0 can be
handled by just returning 0 to the caller, avoiding the following
complex shift + OR operations:

	return value & (1 << (n - 1)) ? value | (~0U << n) : value;

Fixes: dde5845a529f ("[PATCH] Generic HID layer - code split")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: syzbot+1e911ad71dd4ea72e04a@syzkaller.appspotmail.com
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
---
 drivers/hid/hid-core.c |    3 +++
 1 file changed, 3 insertions(+)

--- lnx-510.orig/drivers/hid/hid-core.c
+++ lnx-510/drivers/hid/hid-core.c
@@ -1307,6 +1307,9 @@ EXPORT_SYMBOL_GPL(hid_open_report);
 
 static s32 snto32(__u32 value, unsigned n)
 {
+	if (!value || !n)
+		return 0;
+
 	switch (n) {
 	case 8:  return ((__s8)value);
 	case 16: return ((__s16)value);

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2020-12-17  1:12 [PATCH] HID: core: detect and skip invalid inputs to snto32() Randy Dunlap
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