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SSI: handling of subrequests from other modules (ticket #1263).

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As the SSI parser always uses the context from the main request for storing
variables and blocks, that context should always exist for subrequests using
SSI, even though the main request does not necessarily have SSI enabled.

However, `ngx_http_get_module_ctx(r->main, ...)` is getting NULL in such cases,
resulting in the worker crashing SIGSEGV when accessing its attributes.

This patch links the first initialized context to the main request, and
upgrades it only when main context is initialized.
This commit is contained in:
Ciel Zhao 2022-11-21 17:01:34 +03:00
parent 67e2a69161
commit 053e40e5d4
2 changed files with 29 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/http/modules/ngx_http_ssi_filter_module.c
View File

@ -329,7 +329,7 @@ static ngx_http_variable_t ngx_http_ssi_vars[] = {
static ngx_int_t
ngx_http_ssi_header_filter(ngx_http_request_t *r)
{
ngx_http_ssi_ctx_t *ctx;
ngx_http_ssi_ctx_t *ctx, *mctx;
ngx_http_ssi_loc_conf_t *slcf;
slcf = ngx_http_get_module_loc_conf(r, ngx_http_ssi_filter_module);
@ -341,6 +341,8 @@ ngx_http_ssi_header_filter(ngx_http_request_t *r)
return ngx_http_next_header_filter(r);
}
mctx = ngx_http_get_module_ctx(r->main, ngx_http_ssi_filter_module);
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_ssi_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
@ -367,6 +369,26 @@ ngx_http_ssi_header_filter(ngx_http_request_t *r)
r->filter_need_in_memory = 1;
if (r == r->main) {
if (mctx) {
/*
* if there was a shared context previously used as main,
* copy variables and blocks
*/
ctx->variables = mctx->variables;
ctx->blocks = mctx->blocks;
#if (NGX_PCRE)
ctx->ncaptures = mctx->ncaptures;
ctx->captures = mctx->captures;
ctx->captures_data = mctx->captures_data;
#endif
mctx->shared = 0;
}
ngx_http_clear_content_length(r);
ngx_http_clear_accept_ranges(r);
@ -379,6 +401,10 @@ ngx_http_ssi_header_filter(ngx_http_request_t *r)
} else {
ngx_http_weak_etag(r);
}
} else if (mctx == NULL) {
ngx_http_set_ctx(r->main, ctx, ngx_http_ssi_filter_module);
ctx->shared = 1;
}
return ngx_http_next_header_filter(r);
@ -405,6 +431,7 @@ ngx_http_ssi_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
ctx = ngx_http_get_module_ctx(r, ngx_http_ssi_filter_module);
if (ctx == NULL
|| (ctx->shared && r == r->main)
|| (in == NULL
&& ctx->buf == NULL
&& ctx->in == NULL

1
src/http/modules/ngx_http_ssi_filter_module.h
View File

@ -71,6 +71,7 @@ typedef struct {
u_char *captures_data;
#endif
unsigned shared:1;
unsigned conditional:2;
unsigned encoding:2;
unsigned block:1;