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BUG/MEDIUM: ssl: Crash because of dangling ckch_store reference in a ckch instance

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When updating CAs via the CLI, we need to create new copies of all the
impacted ckch instances (as in referenced in the ckch_inst_link list of
the updated CA) in order to use them instead of the old ones once the
updated is completed. This relies on the ckch_inst_rebuild function that
would set the ckch_store field of the ckch_inst. But we forgot to also
add the newly created instances in the ckch_inst list of the
corresponding ckch_store.

When updating a certificate afterwards, we iterate over all the
instances linked in the ckch_inst list of the ckch_store (which is
missing some instances because of the previous command) and rebuild the
instances before replacing the ckch_store. The previous ckch_store,
still referenced by the dangling ckch instance then gets deleted which
means that the instance keeps a reference to a free'd object.

Then if we were to once again update the CA file, we would iterate over
the ckch instances referenced in the cafile_entry's ckch_inst_link list,
which includes the first mentioned ckch instance with the dead
ckch_store reference. This ends up crashing during the ckch_inst_rebuild
operation.

This bug was raised in GitHub #3165.
This patch should be backported to all stable branches.
This commit is contained in:
Remi Tricot-Le Breton 2025-10-22 16:49:06 +02:00 committed by William Lallemand
parent 2d7e3ddd4a
commit 7482b6ebf0
1 changed files with 5 additions and 1 deletions
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6
src/ssl_ckch.c
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@ -3584,6 +3584,7 @@ static int cli_io_handler_commit_cafile_crlfile(struct appctx *appctx)
list_for_each_entry_from(ckchi_link, &old_cafile_entry->ckch_inst_link, list) {
struct ckch_inst *new_inst;
struct ckch_store *ckch_store = ckchi_link->ckch_inst->ckch_store;
/* save the next ckchi to compute */
ctx->next_ckchi_link = ckchi_link;
@ -3601,11 +3602,14 @@ static int cli_io_handler_commit_cafile_crlfile(struct appctx *appctx)
/* Rebuild a new ckch instance that uses the same ckch_store
* than a reference ckchi instance but will use a new CA file. */
ctx->err = NULL;
if (ckch_inst_rebuild(ckchi_link->ckch_inst->ckch_store, ckchi_link->ckch_inst, &new_inst, &ctx->err)) {
if (ckch_inst_rebuild(ckch_store, ckchi_link->ckch_inst, &new_inst, &ctx->err)) {
ctx->state = CACRL_ST_ERROR;
goto error;
}
/* link the new ckch_inst to the duplicate */
LIST_APPEND(&ckch_store->ckch_inst, &new_inst->by_ckchs);
y++;
}