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block: sed-opal: fix response string extraction 

Tokens are prefixed by a variable length of bytes. If a bytestring is
not stored in an tiny or short atom, we have to skip more than one byte
in order to have the actual bytes not prefixed by the bytes describing
the actual length of the string.

Acked-by: Jonathan Derrick <jonathan.derrick@intel.com>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jonas Rabenstein 2018-03-01 14:26:37 +01:00 committed by Jens Axboe
parent 66231ad3e2
commit d15e1175a9
1 changed files with 23 additions and 3 deletions
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26
block/sed-opal.c
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@ -871,6 +871,9 @@ static int response_parse(const u8 *buf, size_t length,
static size_t response_get_string(const struct parsed_resp *resp, int n,
const char **store)
{
u8 skip;
const struct opal_resp_tok *token;
*store = NULL;
if (!resp) {
pr_debug("Response is NULL\n");
@ -883,13 +886,30 @@ static size_t response_get_string(const struct parsed_resp *resp, int n,
return 0;
}
if (resp->toks[n].type != OPAL_DTA_TOKENID_BYTESTRING) {
token = &resp->toks[n];
if (token->type != OPAL_DTA_TOKENID_BYTESTRING) {
pr_debug("Token is not a byte string!\n");
return 0;
}
*store = resp->toks[n].pos + 1;
return resp->toks[n].len - 1;
switch (token->width) {
case OPAL_WIDTH_TINY:
case OPAL_WIDTH_SHORT:
skip = 1;
break;
case OPAL_WIDTH_MEDIUM:
skip = 2;
break;
case OPAL_WIDTH_LONG:
skip = 4;
break;
default:
pr_debug("Token has invalid width!\n");
return 0;
}
*store = token->pos + skip;
return token->len - skip;
}
static u64 response_get_u64(const struct parsed_resp *resp, int n)