[PATCH 4.14 50/65] firmware: google: increment VPD key_len properly

From: Greg Kroah-Hartman
Date: Wed Oct 16 2019 - 18:12:28 EST

From: Brian Norris <briannorris@xxxxxxxxxxxx>

[ Upstream commit 442f1e746e8187b9deb1590176f6b0ff19686b11 ]

Commit 4b708b7b1a2c ("firmware: google: check if size is valid when
decoding VPD data") adds length checks, but the new vpd_decode_entry()
function botched the logic -- it adds the key length twice, instead of
adding the key and value lengths separately.

On my local system, this means vpd.c's vpd_section_create_attribs() hits
an error case after the first attribute it parses, since it's no longer
looking at the correct offset. With this patch, I'm back to seeing all
the correct attributes in /sys/firmware/vpd/...

Fixes: 4b708b7b1a2c ("firmware: google: check if size is valid when decoding VPD data")
Cc: <stable@xxxxxxxxxxxxxxx>
Cc: Hung-Te Lin <hungte@xxxxxxxxxxxx>
Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Reviewed-by: Guenter Roeck <groeck@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20190930214522.240680-1-briannorris@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/firmware/google/vpd_decode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/google/vpd_decode.c b/drivers/firmware/google/vpd_decode.c
index e75abe9fa122c..6c7ab2ba85d2f 100644
--- a/drivers/firmware/google/vpd_decode.c
+++ b/drivers/firmware/google/vpd_decode.c
@@ -62,7 +62,7 @@ static int vpd_decode_entry(const u32 max_len, const u8 *input_buf,
if (max_len - consumed < *entry_len)
return VPD_FAIL;

- consumed += decoded_len;
+ consumed += *entry_len;
*_consumed = consumed;
return VPD_OK;