wolfSSL/wolfssl
1
0
Fork 1
mirror of https://github.com/wolfSSL/wolfssl.git synced 2025-07-30 02:37:28 +02:00
Code Issues Packages Projects Releases Wiki Activity

SP math all: div handling of length of dividend

Browse Source 
Fail when dividend is maximum size as we may be shifting left and
overflow when divisor is not on a word boundary.
This commit is contained in:
Sean Parkinson
2021-11-30 09:46:11 +10:00
parent 7221e06ff7
commit a3d46bee32
1 changed files with 4 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
wolfcrypt/src/sp_int.c
View File

@ -4614,6 +4614,10 @@ int sp_div(sp_int* a, sp_int* d, sp_int* r, sp_int* rem)
if ((err == MP_OKAY) && (rem != NULL) && (rem->size < a->used + 1)) { if ((err == MP_OKAY) && (rem != NULL) && (rem->size < a->used + 1)) {
err = MP_VAL; err = MP_VAL;
} }
/* May need to shift number being divided left into a new word. */
if ((err == MP_OKAY) && (a->used == SP_INT_DIGITS)) {
err = MP_VAL;
}
#if 0 #if 0
if (err == MP_OKAY) { if (err == MP_OKAY) {