1 files changed, 3 insertions, 2 deletions
diff --git a/src/3rdparty/sha3/KeccakSponge.c b/src/3rdparty/sha3/KeccakSponge.c
index 6f3da95dbb..337c10ccaf 100644
--- a/src/3rdparty/sha3/KeccakSponge.c
+++ b/src/3rdparty/sha3/KeccakSponge.c
@@ -170,9 +170,10 @@ static int Absorb(spongeState *state, const unsigned char *data, unsigned long l
             i += wholeBlocks*state->rate;
         }
         else {
-            partialBlock = (unsigned int)(databitlen - i);
-            if (partialBlock+state->bitsInQueue > state->rate)
+            if (databitlen-i > state->rate - state->bitsInQueue)
                 partialBlock = state->rate-state->bitsInQueue;
+            else
+                partialBlock = (unsigned int)(databitlen - i);
             partialByte = partialBlock % 8;
             partialBlock -= partialByte;
             memcpy(state->dataQueue+state->bitsInQueue/8, data+i/8, partialBlock/8);