From: Guixin Liu Date: Mon, 23 Sep 2024 10:05:12 +0000 (+0800) Subject: io_uring: fix memory leak when cache init fail X-Git-Tag: v6.10.14~425 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b7eab6a58124960cfc4d087c94be6189e5a31a6;p=thirdparty%2Fkernel%2Fstable.git io_uring: fix memory leak when cache init fail [ Upstream commit 3a87e264290d71ec86a210ab3e8d23b715ad266d ] Exit the percpu ref when cache init fails to free the data memory with in struct percpu_ref. Fixes: 206aefde4f88 ("io_uring: reduce/pack size of io_ring_ctx") Signed-off-by: Guixin Liu Reviewed-by: Gabriel Krisman Bertazi Link: https://lore.kernel.org/r/20240923100512.64638-1-kanie@linux.alibaba.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index c0d8ee0c9786d..ff243f6b51199 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -316,7 +316,7 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) sizeof(struct uring_cache)); ret |= io_futex_cache_init(ctx); if (ret) - goto err; + goto free_ref; init_completion(&ctx->ref_comp); xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); mutex_init(&ctx->uring_lock); @@ -344,6 +344,9 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) io_napi_init(ctx); return ctx; + +free_ref: + percpu_ref_exit(&ctx->refs); err: io_alloc_cache_free(&ctx->rsrc_node_cache, kfree); io_alloc_cache_free(&ctx->apoll_cache, kfree);