linux-kernel - [PATCH] eventfd: check ida_simple

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Date:   Tue, 6 Sep 2022 22:37:32 -0400
From:   Bo Liu <liubo03@...pur.com>
To:     <viro@...iv.linux.org.uk>
CC:     <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bo Liu <liubo03@...pur.com>
Subject: [PATCH] eventfd: check ida_simple_get() return value

As ida_simple_get() can fail, we should check the return value.

Signed-off-by: Bo Liu <liubo03@...pur.com>
---
 fs/eventfd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/eventfd.c b/fs/eventfd.c
index c0ffee99ad23..fde730492993 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -428,6 +428,8 @@ static int do_eventfd(unsigned int count, int flags)
 	ctx->count = count;
 	ctx->flags = flags;
 	ctx->id = ida_simple_get(&eventfd_ida, 0, 0, GFP_KERNEL);
+	if (ctx->id < 0)
+		goto err;
 
 	flags &= EFD_SHARED_FCNTL_FLAGS;
 	flags |= O_RDWR;
-- 
2.27.0