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mbedtls: fix handling of blocked sends

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mbedtls is picky when a mbedtls_ssl_write) was previously blocked. It
requires to be called with the same amount of bytes again, or it will
lose bytes, e.g. reporting all was sent but they were not. Remember the
blocked length and use that when set.

Reported-by: Tamás Bálint Misius
Fixes #15801
Closes #15846
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Stefan Eissing 2024-12-28 12:19:19 +01:00 • committed by Daniel Stenberg
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docs/KNOWN_BUGS
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@ -21,6 +21,7 @@ problems may have been fixed or changed somewhat since this was written.
2.7 Client cert (MTLS) issues with Schannel
2.11 Schannel TLS 1.2 handshake bug in old Windows versions
2.13 CURLOPT_CERTINFO results in CURLE_OUT_OF_MEMORY with Schannel
2.14 mbedTLS and CURLE_AGAIN handling
3. Email protocols
3.1 IMAP SEARCH ALL truncated response
@ -159,6 +160,10 @@ problems may have been fixed or changed somewhat since this was written.
https://github.com/curl/curl/issues/8741
2.14 mbedTLS and CURLE_AGAIN handling
https://github.com/curl/curl/issues/15801
3. Email protocols
3.1 IMAP SEARCH ALL truncated response