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signature/rsa_sig.c: Add checks for the EVP_MD_get_size() 

Add checks for the EVP_MD_get_size() to avoid integer overflow and then explicitly cast from int to size_t.

Fixes: 6f4b766315 ("PROV: add RSA signature implementation")
Signed-off-by: Jiasheng Jiang <jiasheng@purdue.edu>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23949)
This commit is contained in:
Jiasheng Jiang 2024-03-22 22:22:23 +00:00 committed by Neil Horman
parent 7638f4016a
commit 6c0f154750
1 changed files with 8 additions and 2 deletions
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10
providers/implementations/signature/rsa_sig.c
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@ -114,8 +114,14 @@ typedef struct {
static size_t rsa_get_md_size(const PROV_RSA_CTX *prsactx)
{
if (prsactx->md != NULL)
return EVP_MD_get_size(prsactx->md);
int md_size;
if (prsactx->md != NULL) {
md_size = EVP_MD_get_size(prsactx->md);
if (md_size <= 0)
return 0;
return md_size;
}
return 0;
}