From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Yongjun Date: Sat, 04 May 2019 06:55:00 +0000 Subject: [PATCH -next] ocxl: Fix return value check in afu_ioctl() Message-Id: <20190504070430.57008-1-weiyongjun1@huawei.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Frederic Barrat , Andrew Donnellan , Arnd Bergmann , Greg Kroah-Hartman , Alastair D'Silva Cc: linuxppc-dev@lists.ozlabs.org, kernel-janitors@vger.kernel.org, Wei Yongjun , linux-kernel@vger.kernel.org In case of error, the function eventfd_ctx_fdget() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). This issue was detected by using the Coccinelle software. Fixes: 060146614643 ("ocxl: move event_fd handling to frontend") Signed-off-by: Wei Yongjun --- drivers/misc/ocxl/file.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c index 8aa22893ed76..2870c25da166 100644 --- a/drivers/misc/ocxl/file.c +++ b/drivers/misc/ocxl/file.c @@ -257,8 +257,8 @@ static long afu_ioctl(struct file *file, unsigned int cmd, return -EINVAL; irq_id = ocxl_irq_offset_to_id(ctx, irq_fd.irq_offset); ev_ctx = eventfd_ctx_fdget(irq_fd.eventfd); - if (!ev_ctx) - return -EFAULT; + if (IS_ERR(ev_ctx)) + return PTR_ERR(ev_ctx); rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx); break;