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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