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Merge pull request #3504 from SparkiDev/fp_div_oob_read

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TFM div: fix initial value of size in q so clamping doesn't OOB read
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toddouska
2020-11-18 16:15:08 -08:00
committed by GitHub
parent ca281f976e 837de435ba
commit 3808865f57
1 changed files with 2 additions and 1 deletions
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3
wolfcrypt/src/tfm.c
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@@ -679,7 +679,8 @@ int fp_div(fp_int *a, fp_int *b, fp_int *c, fp_int *d)
#endif #endif
fp_init(q); fp_init(q);
q->used = a->used + 2; /* qb + d = a, and b is an integer > 0, therefore q <= a */
q->used = a->used;
fp_init(t1); fp_init(t1);
fp_init(t2); fp_init(t2);