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Fix overflow in fp_to_unsigned_bin_len length check. (#6075)

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* Fix overflow in fp_to_unsigned_bin_len length check.
* Add a second check when i == a->used - 1.
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philljj 2023-02-10 10:46:37 -06:00 committed by GitHub
parent c2384674d8
commit 5b8fda1ac6
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1 changed files with 4 additions and 1 deletions
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wolfcrypt/src/tfm.c
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@ -3834,7 +3834,10 @@ int fp_to_unsigned_bin_len(fp_int *a, unsigned char *b, int c)
for (; x >= 0; x--) {
b[x] = 0;
}
if ((i < a->used - 1) || ((a->dp[i] >> j) != 0)) {
if (i < a->used - 1) {
return FP_VAL;
}
if ((i == a->used - 1) && ((a->dp[i] >> j) != 0)) {
return FP_VAL;
}