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MacOS (Arm64) crash on curl += 7.76 #7308

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@richardmarion

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@richardmarion

With the addition of the statement of "full-size = (size_t) data->set.max_send_speed" on line 1179-1182 in http.c in commit 24e469f#diff-14c8235d370910f1781de1a00ed1957ec948e84e88fdc52db87bd4eb7c7167ff made for 7.76, MacOS crashes in memcpy on line 1205.

I did this. Built version 7.75 and version 7.76 from sources for arm64 target. Once I took out line 1179-1182 from http.c, I was able to run overnight without memory violation crashes.

I expected the following. I expected both versions to work

curl/libcurl version - 7.75 & 7.76

[curl -V output]

MacOS 11.4

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