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authorMaxim Dounin <mdounin@mdounin.ru>2016-05-31 05:13:30 +0300
committerMaxim Dounin <mdounin@mdounin.ru>2016-05-31 05:13:30 +0300
commita3d382397a00853cf07b21d07fe10a4c10b88244 (patch)
treefc6a343b25c01887202a358e32c52f5615081909 /src/http/ngx_http_request.c
parent9f0253e1e2dcfad7d81f49877228b864c617c9fa (diff)
downloadnginx-a3d382397a00853cf07b21d07fe10a4c10b88244.tar.gz
nginx-a3d382397a00853cf07b21d07fe10a4c10b88244.zip
Core: skip special buffers on writing (ticket #981).
A special last buffer with cl->buf->pos set to NULL can be present in a chain when writing request body if chunked encoding was used. This resulted in a NULL pointer dereference if it happened to be the only buffer left after a do...while loop iteration in ngx_write_chain_to_file(). The problem originally appeared in nginx 1.3.9 with chunked encoding support. Additionally, rev. 3832b608dc8d (nginx 1.9.13) changed the minimum number of buffers to trigger this from IOV_MAX (typically 1024) to NGX_IOVS_PREALLOCATE (typically 64). Fix is to skip such buffers in ngx_chain_to_iovec(), much like it is done in other places.
Diffstat (limited to 'src/http/ngx_http_request.c')
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