The ability to pause input processing was added in 8a4a193 but
introduced a session memory accounting mismatch leading to potential
NGHTTP2_ENHANCE_YOUR_CALM errors.
After pausing
(f36331c1bf/src/node_http2.cc (L871)),
the early return on line 873 skips the
DecrementCurrentSessionMemory(stream_buf_.len) call below (line 878).
When we later finished processing the input chunk
(f36331c1bf/src/node_http2.cc (L1858)),
we were calling DecrementCurrentSessionMemory(stream_buf_offset_) [line
1875] which was a no-op since we just set stream_buf_offset_ to 0 [line
1873].
The correct amount to decrement by is still stream_buf_.len, since
that's the amount we skipped previously (line 878).
Fixes: https://github.com/nodejs/node/issues/29223
Refs: 164ac5b241
PR-URL: https://github.com/nodejs/node/pull/30684
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
