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authorLinus Torvalds <torvalds@linux-foundation.org>2023-04-08 11:34:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2023-04-08 11:34:17 -0700
commitd3f05a4c428565163f26b5d34f60f02ee4ea4009 (patch)
treed575facda7a2a6c97a7bcd874168c22b094782ff /io_uring
parent973ad544f04a5eff3435fd36e02392c5afeafc0f (diff)
parentb4a72c0589fdea6259720375426179888969d6a2 (diff)
Merge tag 'io_uring-6.3-2023-04-06' of git://git.kernel.dk/linux
Pull io_uring fixes from Jens Axboe: "Just two minor fixes for provided buffers - one where we could potentially leak a buffer, and one where the returned values was off-by-one in some cases" * tag 'io_uring-6.3-2023-04-06' of git://git.kernel.dk/linux: io_uring: fix memory leak when removing provided buffers io_uring: fix return value when removing provided buffers
Diffstat (limited to 'io_uring')
-rw-r--r--io_uring/io_uring.c2
-rw-r--r--io_uring/kbuf.c7
2 files changed, 5 insertions, 4 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 722624b6d0dc..2a8b8c304d2a 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2789,8 +2789,8 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
io_eventfd_unregister(ctx);
io_alloc_cache_free(&ctx->apoll_cache, io_apoll_cache_free);
io_alloc_cache_free(&ctx->netmsg_cache, io_netmsg_cache_free);
- mutex_unlock(&ctx->uring_lock);
io_destroy_buffers(ctx);
+ mutex_unlock(&ctx->uring_lock);
if (ctx->sq_creds)
put_cred(ctx->sq_creds);
if (ctx->submitter_task)
diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c
index 3002dc827195..a90c820ce99e 100644
--- a/io_uring/kbuf.c
+++ b/io_uring/kbuf.c
@@ -228,17 +228,18 @@ static int __io_remove_buffers(struct io_ring_ctx *ctx,
return i;
}
- /* the head kbuf is the list itself */
+ /* protects io_buffers_cache */
+ lockdep_assert_held(&ctx->uring_lock);
+
while (!list_empty(&bl->buf_list)) {
struct io_buffer *nxt;
nxt = list_first_entry(&bl->buf_list, struct io_buffer, list);
- list_del(&nxt->list);
+ list_move(&nxt->list, &ctx->io_buffers_cache);
if (++i == nbufs)
return i;
cond_resched();
}
- i++;
return i;
}