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Fix out-of-bounds write in fp_mod_2d.

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jordan
2023-04-18 10:51:38 -05:00
parent 42b73ee326
commit 8254112c9b
1 changed files with 7 additions and 0 deletions
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7
wolfcrypt/src/tfm.c
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@ -1010,6 +1010,13 @@ void fp_mod_2d(fp_int *a, int b, fp_int *c)
}
bmax = ((unsigned int)b + DIGIT_BIT - 1) / DIGIT_BIT;
/* If a is negative and bmax is larger than FP_SIZE, then the
* result can't fit within c. Just return. */
if (c->sign == FP_NEG && bmax > FP_SIZE) {
return;
}
/* zero digits above the last digit of the modulus */
for (x = bmax; x < (unsigned int)c->used; x++) {
c->dp[x] = 0;