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SP int: fail when buffer writing to is too small for number

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This commit is contained in:
Sean Parkinson
2023-01-13 02:12:03 +10:00
parent b2d8b1c2fd
commit c22b89e935
1 changed files with 6 additions and 1 deletions
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7
wolfcrypt/src/sp_int.c
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@ -16878,11 +16878,16 @@ int sp_to_unsigned_bin_len(const sp_int* a, byte* out, int outSz)
/* Put each digit in. */ /* Put each digit in. */
for (i = 0; (j >= 0) && (i < a->used); i++) { for (i = 0; (j >= 0) && (i < a->used); i++) {
int b; int b;
sp_int_digit d = a->dp[i];
/* Place each byte of a digit into the buffer. */ /* Place each byte of a digit into the buffer. */
for (b = 0; b < SP_WORD_SIZE; b += 8) { for (b = 0; b < SP_WORD_SIZE; b += 8) {
out[j--] = (byte)(a->dp[i] >> b); out[j--] = (byte)d;
d >>= 8;
/* Stop if the output buffer is filled. */ /* Stop if the output buffer is filled. */
if (j < 0) { if (j < 0) {
if ((i < a->used - 1) || (d > 0)) {
err = BUFFER_E;
}
break; break;
} }
} }