libcurl Version 7.66 crashes when uploading a file using https

Hi,

While upgrading from libcurl version 7.56.1 to 7.66, I am facing a crash.
This is while i am trying to upload a file in chunks using https protocol.
I have set the read callback function using

 curl_easy_setopt(m_curl_upload_resume, CURLOPT_READFUNCTION,
upload_resume_read_callback);

/* which file to upload */
curl_easy_setopt(m_curl_upload_resume, CURLOPT_READDATA, (void *)&hd);

I have modified CURL_MAX_WRITE_SIZE from 16384 to 1048608 in order to read
1MB. I have recompiled the libcurl Version 7.66 and observed the libcurl
crash while uploading. Following is the crash dump.
* read function returned funny value

*** Error in `./dtf_co: double free or corruption (!prev):
0x00007f0d58126cd0 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x7908b)[0x7f0d6097a08b]
/lib/x86_64-linux-gnu/libc.so.6(+0x82c3a)[0x7f0d60983c3a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f0d60987d2c]
/app/staging/pr_1awcore/native/release/ad/usr/local/lib/libcurl.so.4(+0x42e09)[0x7f0d619b4e09]
/app/staging/pr_1awcore/native/release/ad/usr/local/lib/libcurl.so.4(+0x45ad9)[0x7f0d619b7ad9]
/app/staging/pr_1awcore/native/release/ad/usr/local/lib/libcurl.so.4(curl_multi_perform+0xd8)[0x7f0d619b811d]
/app/staging/pr_1awcore/native/release/ad/usr/local/lib/libcurl.so.4(+0x3a7ff)[0x7f0d619ac7ff]
/app/staging/pr_1awcore/native/release/ad/usr/local/lib/libcurl.so.4(+0x3aa6d)[0x7f0d619aca6d]
/app/staging/pr_1awcore/native/release/ad/usr/local/lib/libcurl.so.4(curl_easy_perform+0x1d)[0x7f0d619acadb]
/home/ubuntu/Version_10/staging/pr_1awcore/native/release/ad/usr/1aw/lib/libopen_auth_client.so(_ZN16Open_auth_client24https_upload_file_resumeENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES5_S5_S5_S5_S5_S5_S5_S5_S5_S5_mmmRmiS5_RS5_S7_+0x81d)[0x7f0d6255c49d]
./dtf_agent_comm(+0x15f55)[0x55f81536bf55]
./dtf_agent_comm(+0x1ea1d)[0x55f815374a1d]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x76da)[0x7f0d6126e6da]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x5f)[0x7f0d60a09d7f]

What puzzles me is the same code works on the libcurl version 7.56.1 with
the CURL_MAX_WRITE_SIZE set to 1048608.

Any help is highly appreciated.

-- 
*Thanks and Regards,*
*Arun J*

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Received on 2019-11-27