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HID: prodikeys: Check presence of pm->input_ep82

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[ Upstream commit cee8337e1bad168136aecfe6416ecd7d3aa7529a ]

Fake USB devices can send their own report descriptors for which the
input_mapping() hook does not get called.  In this case, pm->input_ep82 stays
NULL, which leads to a crash later.

This does not happen with the real device, but can be provoked by imposing as
one.

Cc: stable@vger.kernel.org
Signed-off-by: Günther Noack <gnoack@google.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>
This commit is contained in:
Günther Noack
2026-01-09 11:58:08 +01:00
committed by Ulrich Hecht
parent f57ed48230
commit bf34bf2b4e
1 changed files with 4 additions and 0 deletions
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4
drivers/hid/hid-prodikeys.c
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@ -392,6 +392,10 @@ static int pcmidi_handle_report4(struct pcmidi_snd *pm, u8 *data)
bit_mask = (bit_mask << 8) | data[2];
bit_mask = (bit_mask << 8) | data[3];
/* robustness in case input_mapping hook does not get called */
if (!pm->input_ep82)
return 0;
/* break keys */
for (bit_index = 0; bit_index < 24; bit_index++) {
if (!((0x01 << bit_index) & bit_mask)) {