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crypto: api - Use work queue in crypto_destroy_instance 

The function crypto_drop_spawn expects to be called in process
context.  However, when an instance is unregistered while it still
has active users, the last user may cause the instance to be freed
in atomic context.

Fix this by delaying the freeing to a work queue.

Fixes: 6bfd48096f ("[CRYPTO] api: Added spawns")
Reported-by: Florent Revest <revest@chromium.org>
Reported-by: syzbot+d769eed29cc42d75e2a3@syzkaller.appspotmail.com
Reported-by: syzbot+610ec0671f51e838436e@syzkaller.appspotmail.com
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Florent Revest <revest@chromium.org>
Acked-by: Florent Revest <revest@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2023-08-03 17:59:28 +08:00
parent 7999b615fd
commit 9ae4577bc0
2 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
crypto/algapi.c
View File

@ -17,6 +17,7 @@
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/workqueue.h>
#include "internal.h"
@ -74,15 +75,26 @@ static void crypto_free_instance(struct crypto_instance *inst)
inst->alg.cra_type->free(inst);
}
static void crypto_destroy_instance(struct crypto_alg *alg)
static void crypto_destroy_instance_workfn(struct work_struct *w)
{
struct crypto_instance *inst = (void *)alg;
struct crypto_instance *inst = container_of(w, struct crypto_instance,
free_work);
struct crypto_template *tmpl = inst->tmpl;
crypto_free_instance(inst);
crypto_tmpl_put(tmpl);
}
static void crypto_destroy_instance(struct crypto_alg *alg)
{
struct crypto_instance *inst = container_of(alg,
struct crypto_instance,
alg);
INIT_WORK(&inst->free_work, crypto_destroy_instance_workfn);
schedule_work(&inst->free_work);
}
/*
* This function adds a spawn to the list secondary_spawns which
* will be used at the end of crypto_remove_spawns to unregister

3
include/crypto/algapi.h
View File

@ -12,6 +12,7 @@
#include <linux/cache.h>
#include <linux/crypto.h>
#include <linux/types.h>
#include <linux/workqueue.h>
/*
* Maximum values for blocksize and alignmask, used to allocate
@ -82,6 +83,8 @@ struct crypto_instance {
struct crypto_spawn *spawns;
};
struct work_struct free_work;
void *__ctx[] CRYPTO_MINALIGN_ATTR;
};