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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id f5sm6177781iok.4.2020.05.12.12.43.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 May 2020 12:43:09 -0700 (PDT) From: Shuah Khan To: viro@zeniv.linux.org.uk, axboe@kernel.dk, zohar@linux.vnet.ibm.com, mcgrof@kernel.org, keescook@chromium.org Cc: Shuah Khan , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] fs: avoid fdput() after failed fdget() in ksys_sync_file_range() Date: Tue, 12 May 2020 13:43:04 -0600 Message-Id: <71cc3966f60f884924f9dff8875ed478e858dca1.1589311577.git.skhan@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Fix ksys_sync_file_range() to avoid fdput() after a failed fdget(). fdput() doesn't do fput() on this file since FDPUT_FPUT isn't set in fd.flags. Change it anyway since failed fdget() doesn't require a fdput(). Refine the code path a bit for it to read more clearly. Reference: commit 22f96b3808c1 ("fs: add sync_file_range() helper") Signed-off-by: Shuah Khan --- fs/sync.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/fs/sync.c b/fs/sync.c index 4d1ff010bc5a..300ca73ec87c 100644 --- a/fs/sync.c +++ b/fs/sync.c @@ -364,15 +364,15 @@ int sync_file_range(struct file *file, loff_t offset, loff_t nbytes, int ksys_sync_file_range(int fd, loff_t offset, loff_t nbytes, unsigned int flags) { - int ret; - struct fd f; + int ret = -EBADF; + struct fd f = fdget(fd); - ret = -EBADF; - f = fdget(fd); - if (f.file) - ret = sync_file_range(f.file, offset, nbytes, flags); + if (!f.file) + goto out; + ret = sync_file_range(f.file, offset, nbytes, flags); fdput(f); +out: return ret; } -- 2.25.1