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BUG/MEDIUM: promex: Use right context pointers to dump backends extra-counters

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When backends extra counters are dumped, the wrong pointer was used in the
promex context to retrieve the stats module. p[1] must be used instead of
p[2]. Because of this typo, a infinite loop could be experienced if the
output buffer is full during this stage. But in all cases an overflow is
possible leading to a memory corruption.

This patch may be related to issue #2831. It must be backported as far as
3.0.
This commit is contained in:
Christopher Faulet 2025-01-14 07:39:48 +01:00
parent 8919a80da9
commit 91578212d7
1 changed files with 1 additions and 1 deletions
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2
addons/promex/service-prometheus.c
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@ -1037,7 +1037,7 @@ static int promex_dump_back_metrics(struct appctx *appctx, struct htx *htx)
static struct ist prefix = IST("haproxy_backend_");
struct promex_ctx *ctx = appctx->svcctx;
struct proxy *px = ctx->p[0];
struct stats_module *mod = ctx->p[2];
struct stats_module *mod = ctx->p[1];
struct server *sv;
struct field val;
struct channel *chn = sc_ic(appctx_sc(appctx));