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transfer: avoid busy loop with tiny speed limit

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When a transfer has a speed limit less than 4, the receive loop early
exits without receiving anything, causing a busy loop for that transfer.

Perform that check only after the first receive has been done.

Reported in Joshua's sarif data

Closes #18732
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Stefan Eissing 2025-09-25 13:25:29 +02:00 • committed by Daniel Stenberg
parent 771dd9d9e7
commit 221b7dda38
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2
lib/transfer.c
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@ -283,7 +283,7 @@ static CURLcode sendrecv_dl(struct Curl_easy *data,
* a quarter of the quota, break out. We want to stutter a bit
* to keep in the limit, but too small receives will just cost
* cpu unnecessarily. */
if(total_received >= (data->set.max_recv_speed / 4))
if(total_received && (total_received >= (data->set.max_recv_speed / 4)))
break;
if(data->set.max_recv_speed < (curl_off_t)bytestoread)
bytestoread = (size_t)data->set.max_recv_speed;