res_pjsip_header_funcs: Duplicate new header value, don't copy.
When updating an existing header the 'update' code incorrectly just copied the new value into the existing buffer. If the new value exceeded the available buffer size memory outside of the buffer would be written into, potentially causing a crash. This change makes it so that the 'update' now duplicates the new header value instead of copying it into the existing buffer.
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@ -676,6 +676,7 @@ static int add_header(void *obj)
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static int update_header(void *obj)
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{
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struct header_data *data = obj;
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pj_pool_t *pool = data->channel->session->inv_session->dlg->pool;
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pjsip_hdr *hdr = NULL;
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RAII_VAR(struct ast_datastore *, datastore,
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ast_sip_session_get_datastore(data->channel->session, data->header_datastore->type),
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@ -694,7 +695,7 @@ static int update_header(void *obj)
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return -1;
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}
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pj_strcpy2(&((pjsip_generic_string_hdr *) hdr)->hvalue, data->header_value);
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pj_strdup2(pool, &((pjsip_generic_string_hdr *) hdr)->hvalue, data->header_value);
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return 0;
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}
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