linux-kernel - [PATCH] btfrs: initialize return of btrfs_extent

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Message-Id: <20200705142058.28305-1-trix@redhat.com>
Date:   Sun,  5 Jul 2020 07:20:58 -0700
From:   trix@...hat.com
To:     clm@...com, josef@...icpanda.com, dsterba@...e.com
Cc:     linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] btfrs: initialize return of btrfs_extent_same

From: Tom Rix <trix@...hat.com>

clang static analysis flags a garbage return

fs/btrfs/reflink.c:611:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn]
        return ret;
        ^~~~~~~~~~
ret will not be set when olen is 0
When olen is 0, this function does no work.

So initialize ret to 0

Signed-off-by: Tom Rix <trix@...hat.com>
---
 fs/btrfs/reflink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/reflink.c b/fs/btrfs/reflink.c
index 040009d1cc31..200a80fcbecb 100644
--- a/fs/btrfs/reflink.c
+++ b/fs/btrfs/reflink.c
@@ -572,7 +572,7 @@ static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 len,
 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
 			     struct inode *dst, u64 dst_loff)
 {
-	int ret;
+	int ret = 0;
 	u64 i, tail_len, chunk_count;
 	struct btrfs_root *root_dst = BTRFS_I(dst)->root;
 
-- 
2.18.1