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Correct the fix for the PKCS 7 memory leak

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This corrects an issue in the origina fix in
4f01121f6e.

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
This commit is contained in:
Bence Szépkúti
2022-12-12 21:37:36 +01:00
parent 1362c5ab16
commit f7641544ea
1 changed files with 23 additions and 22 deletions
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45
library/pkcs7.c
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@@ -253,6 +253,24 @@ static int pkcs7_get_signature( unsigned char **p, unsigned char *end,
return( 0 ); return( 0 );
} }
static void pkcs7_free_signer_info( mbedtls_pkcs7_signer_info *signer )
{
mbedtls_x509_name *name_cur;
mbedtls_x509_name *name_prv;
if( signer == NULL )
return;
name_cur = signer->issuer.next;
while( name_cur != NULL )
{
name_prv = name_cur;
name_cur = name_cur->next;
mbedtls_free( name_prv );
}
signer->issuer.next = NULL;
}
/** /**
* SignerInfo ::= SEQUENCE { * SignerInfo ::= SEQUENCE {
* version Version; * version Version;
@@ -329,33 +347,16 @@ static int pkcs7_get_signer_info( unsigned char **p, unsigned char *end,
ret = MBEDTLS_ERR_PKCS7_INVALID_SIGNER_INFO; ret = MBEDTLS_ERR_PKCS7_INVALID_SIGNER_INFO;
out: out:
if( asn1_ret != 0 ) if( asn1_ret != 0 || ret != 0 )
{
pkcs7_free_signer_info( signer );
ret = MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS7_INVALID_SIGNER_INFO, ret = MBEDTLS_ERROR_ADD( MBEDTLS_ERR_PKCS7_INVALID_SIGNER_INFO,
asn1_ret ); asn1_ret );
else if( ret != 0 ) }
ret = MBEDTLS_ERR_PKCS7_INVALID_SIGNER_INFO;
return( ret ); return( ret );
} }
static void pkcs7_free_signer_info( mbedtls_pkcs7_signer_info *signer )
{
mbedtls_x509_name *name_cur;
mbedtls_x509_name *name_prv;
if( signer == NULL )
return;
name_cur = signer->issuer.next;
while( name_cur != NULL )
{
name_prv = name_cur;
name_cur = name_cur->next;
mbedtls_free( name_prv );
}
signer->issuer.next = NULL;
}
/** /**
* SignerInfos ::= SET of SignerInfo * SignerInfos ::= SET of SignerInfo
* Return number of signers added to the signed data, * Return number of signers added to the signed data,
@@ -387,7 +388,7 @@ static int pkcs7_get_signers_info_set( unsigned char **p, unsigned char *end,
ret = pkcs7_get_signer_info( p, end_set, signers_set ); ret = pkcs7_get_signer_info( p, end_set, signers_set );
if( ret != 0 ) if( ret != 0 )
goto cleanup; return( ret );
count++; count++;
mbedtls_pkcs7_signer_info *prev = signers_set; mbedtls_pkcs7_signer_info *prev = signers_set;