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-rw-r--r--src/common/crypto.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/common/crypto.c b/src/common/crypto.c
index f91391780a..522c1375c9 100644
--- a/src/common/crypto.c
+++ b/src/common/crypto.c
@@ -2990,9 +2990,11 @@ secret_to_key(char *key_out, size_t key_out_len, const char *secret,
void
memwipe(void *mem, uint8_t byte, size_t sz)
{
- if (mem == NULL || sz == 0) {
+ if (sz == 0) {
return;
}
+ /* If sz is nonzero, then mem must not be NULL. */
+ tor_assert(mem != NULL);
/* Data this large is likely to be an underflow. */
tor_assert(sz < SIZE_T_CEILING);