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hashes/sha256: don't call memcpy if len==0

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This commit is contained in:
Kaspar Schleiser 2019-01-17 10:56:34 +01:00
parent e65a017f19
commit d6390b3685
1 changed files with 3 additions and 1 deletions
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4
sys/hashes/sha256.c
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@ -223,7 +223,9 @@ void sha256_update(sha256_context_t *ctx, const void *data, size_t len)
/* Handle the case where we don't need to perform any transforms */
if (len < 64 - r) {
memcpy(&ctx->buf[r], data, len);
if (len > 0) {
memcpy(&ctx->buf[r], data, len);
}
return;
}