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crypto: ccp - avoid uninitialized variable warning 

The added support for version 5 CCPs introduced a false-positive
warning in the RSA implementation:

drivers/crypto/ccp/ccp-ops.c: In function 'ccp_run_rsa_cmd':
drivers/crypto/ccp/ccp-ops.c:1856:3: error: 'sb_count' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This changes the code in a way that should make it easier for
the compiler to track the state of the sb_count variable, and
avoid the warning.

Fixes: 6ba46c7d4d ("crypto: ccp - Fix base RSA function for version 5 CCPs")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Arnd Bergmann 2017-07-31 22:49:21 +02:00 committed by Herbert Xu
parent c871c10e4e
commit d634baea62
1 changed files with 2 additions and 1 deletions
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3
drivers/crypto/ccp/ccp-ops.c
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@ -1785,6 +1785,7 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
o_len = 32 * ((rsa->key_size + 255) / 256);
i_len = o_len * 2;
sb_count = 0;
if (cmd_q->ccp->vdata->version < CCP_VERSION(5, 0)) {
/* sb_count is the number of storage block slots required
* for the modulus.
@ -1879,7 +1880,7 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
ccp_dm_free(&exp);
e_sb:
if (cmd_q->ccp->vdata->version < CCP_VERSION(5, 0))
if (sb_count)
cmd_q->ccp->vdata->perform->sbfree(cmd_q, op.sb_key, sb_count);
return ret;