Mp4: added and updated sanity checks for "end" handling. When handling incorrect data in ngx_http_mp4_crop_stsc_data(), trak->end_chunk_samples might end up being arbitrary large, leading to reading before the buffer in ngx_http_mp4_update_stsz_atom(). Fix is to check that trak->end_chunk_samples corresponds to a memory within the stsz atom data. For consistency, trak->start_chunk_samples is checked similarly. Similarly, trak->end_chunk might end up being smaller than trak->start_chunk, leading to reading memory after the buffer in ngx_http_mp4_update_stco_atom() and ngx_http_mp4_update_co64_atom(). Corresponding checks are updated to explicitly test (trak->end_chunk - trak->start_chunk) instead of just checking trak->end_chunk and assuming it is larger than trak->start_chunk. This is generally in line with existing checks of (trak->end_sample - trak->start_sample) in ngx_http_mp4_update_stsz_atom(), where trak->end_sample might also become smaller than trak->start_sample when handling incorrect data in ngx_http_mp4_crop_stts_data().

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_DARWIN_H_INCLUDED_
#define _NGX_DARWIN_H_INCLUDED_


void ngx_debug_init(void);
ngx_chain_t *ngx_darwin_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in,
    off_t limit);

extern int       ngx_darwin_kern_osreldate;
extern int       ngx_darwin_hw_ncpu;
extern u_long    ngx_darwin_net_inet_tcp_sendspace;

extern ngx_uint_t  ngx_debug_malloc;


#endif /* _NGX_DARWIN_H_INCLUDED_ */