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Re: [PATCH] Fixed handling of very long locations (ticket #2435)

Sergey Kandaurov
January 25, 2023 07:10AM
> On 18 Jan 2023, at 23:50, Maxim Dounin <mdounin@mdounin.ru> wrote:
>
> # HG changeset patch
> # User Maxim Dounin <mdounin@mdounin.ru>
> # Date 1674071317 -10800
> # Wed Jan 18 22:48:37 2023 +0300
> # Node ID 4af6cc78dc72fbb15326e6ffbbd30935f0cb794b
> # Parent 07b0bee87f32be91a33210bc06973e07c4c1dac9
> Fixed handling of very long locations (ticket #2435).
>
> Previously, location prefix length in ngx_http_location_tree_node_t was
> stored as "u_char", and therefore location prefixes longer than 255 bytes
> were handled incorrectly.
>
> Fix is to use "u_short" instead. With "u_short", prefixes up to 65535 bytes
> can be safely used, and this isn't reachable due to NGX_CONF_BUFFER, which
> is 4096 bytes.
>
> diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
> --- a/src/http/ngx_http.c
> +++ b/src/http/ngx_http.c
> @@ -1130,7 +1130,7 @@ ngx_http_create_locations_tree(ngx_conf_
> node->auto_redirect = (u_char) ((lq->exact && lq->exact->auto_redirect)
> || (lq->inclusive && lq->inclusive->auto_redirect));
>
> - node->len = (u_char) len;
> + node->len = (u_short) len;
> ngx_memcpy(node->name, &lq->name->data[prefix], len);
>
> ngx_queue_split(locations, q, &tail);
> diff --git a/src/http/ngx_http_core_module.h b/src/http/ngx_http_core_module.h
> --- a/src/http/ngx_http_core_module.h
> +++ b/src/http/ngx_http_core_module.h
> @@ -463,8 +463,8 @@ struct ngx_http_location_tree_node_s {
> ngx_http_core_loc_conf_t *exact;
> ngx_http_core_loc_conf_t *inclusive;
>
> + u_short len;
> u_char auto_redirect;
> - u_char len;
> u_char name[1];
> };
>

Looks good.

--
Sergey Kandaurov
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Subject Author Views Posted

[PATCH] Fixed handling of very long locations (ticket #2435)

Maxim Dounin 176 January 18, 2023 02:52PM

Re: [PATCH] Fixed handling of very long locations (ticket #2435)

Sergey Kandaurov 4 January 25, 2023 07:10AM

Re: [PATCH] Fixed handling of very long locations (ticket #2435)

Maxim Dounin 4 January 25, 2023 09:32PM



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