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[api] Add safety check for full write in write_raw_iov_ before enqueue

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When called directly (not via write_raw_fast_iov_), sent could equal
total_write_len. Check before enqueueing to avoid a no-op enqueue.
This commit is contained in:
J. Nick Koston
2026-03-29 13:40:24 -10:00
parent 41f770a624
commit 6ff0d33ca4
1 changed files with 4 additions and 0 deletions
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esphome/components/api/api_frame_helper.cpp
+4
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@@ -155,6 +155,10 @@ APIError APIFrameHelper::write_raw_iov_(const struct iovec *iov, int iovcnt, uin
}
}
// Full write completed (possible when called directly, not via write_raw_fast_iov_)
if (sent == static_cast<ssize_t>(total_write_len))
return APIError::OK;
// Queue unsent data into overflow buffer
if (!this->overflow_buf_.enqueue_iov(iov, iovcnt, total_write_len, static_cast<uint16_t>(sent))) {
HELPER_LOG("Overflow buffer full, dropping connection");