codec: check codec context allocation#1806
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The per-session codec context allocated with ngx_pcalloc() was dereferenced without a NULL check in ngx_rtmp_codec_av() and ngx_rtmp_codec_meta_data(). Return NGX_ERROR on failure. Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Dmitry Mihalchenko <tascad@altlinux.org>
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ngx_rtmp_codec_av()andngx_rtmp_codec_meta_data()allocate the per-session codec context from the connection pool and dereference the result without checking for NULL.ngx_pcalloc()can return NULL under memory pressure, which would lead to a NULL pointer dereference and a worker crash.Add the missing NULL checks, returning
NGX_ERRORon allocation failure.