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Fix sz==0 buffer underflow in devcrypto AES-CBC

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This commit is contained in:
Jeremiah Mackey
2026-03-18 17:00:31 +00:00
parent 816978050a
commit b85e500ffa
1 changed files with 7 additions and 1 deletions
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wolfcrypt/src/port/devcrypto/devcrypto_aes.c
+7 -1
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@@ -44,8 +44,11 @@ int wc_AesCbcEncrypt(Aes* aes, byte* out, const byte* in, word32 sz)
return BAD_FUNC_ARG;
}
/* encrypt only up to AES block size of date */
/* encrypt only up to AES block size of data */
sz = sz - (sz % WC_AES_BLOCK_SIZE);
if (sz == 0) {
return 0;
}
if (aes->ctx.cfd == -1) {
ret = wc_DevCryptoCreate(&aes->ctx, CRYPTO_AES_CBC,
(byte*)aes->devKey, aes->keylen);
@@ -74,6 +77,9 @@ int wc_AesCbcDecrypt(Aes* aes, byte* out, const byte* in, word32 sz)
if (aes == NULL || out == NULL || in == NULL || sz % WC_AES_BLOCK_SIZE != 0) {
return BAD_FUNC_ARG;
}
if (sz == 0) {
return 0;
}
XMEMCPY(aes->tmp, in + sz - WC_AES_BLOCK_SIZE, WC_AES_BLOCK_SIZE);
if (aes->ctx.cfd == -1) {