[PATCH 6.18 031/752] i3c: mipi-i3c-hci: Stop reading Extended Capabilities if capability ID is 0

Sasha Levin
2026-02-28T17:48:35Z

From: Adrian Hunter <adrian.hunter@intel.com>

[ Upstream commit 0818e4aa8fdeeed5973e0a8faeddc9da599fc897 ]

Extended Capability ID value 0 is special. It signifies the end of the
list. Stop reading Extended Capabilities if capability ID is 0.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260106164416.67074-3-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/i3c/master/mipi-i3c-hci/ext_caps.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i3c/master/mipi-i3c-hci/ext_caps.c b/drivers/i3c/master/mipi-i3c-hci/ext_caps.c
index 7714f00ea9cc0..533a495e14c86 100644
--- a/drivers/i3c/master/mipi-i3c-hci/ext_caps.c
+++ b/drivers/i3c/master/mipi-i3c-hci/ext_caps.c
@@ -272,7 +272,7 @@ int i3c_hci_parse_ext_caps(struct i3c_hci *hci)
cap_length = FIELD_GET(CAP_HEADER_LENGTH, cap_header);
dev_dbg(&hci->master.dev, "id=0x%02x length=%d",
cap_id, cap_length);
- if (!cap_length)
+ if (!cap_id || !cap_length)
break;
if (curr_cap + cap_length * 4 >= end) {
dev_err(&hci->master.dev,
--
2.51.0