platform/x86: hp-bioscfg: fix password encoding bounds check

The password PSWD_ENCODINGS parser reads password_obj[elem + pos_values]
while copying the supported password encodings from the ACPI package.

The outer loop only guarantees that elem is within password_obj_count.
The encoding count is bounded by MAX_ENCODINGS_SIZE, but that does not
guarantee that the ACPI package contains enough entries for all
elem + pos_values accesses.

A malformed package can therefore declare a non-zero encoding count
without providing enough string objects, causing the parser to read past
the ACPI package array and pass an out-of-bounds string pointer and
length to hp_convert_hexstr_to_str().

Add the same computed-index bounds check used by the other offset-based
package parsing loops before reading password_obj[elem + pos_values].

Fixes: 8646a3b5ee3a ("platform/x86: hp-bioscfg: passwdobj-attributes")
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
Link: https://patch.msgid.link/20260708090937.740435-1-lgs201920130244@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

0 files changed, 0 insertions, 0 deletions