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Message-Id: <20200617130711.23434-1-trix@redhat.com>
Date: Wed, 17 Jun 2020 06:07:11 -0700
From: trix@...hat.com
To: viro@...iv.linux.org.uk
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
Tom Rix <trix@...hat.com>
Subject: [PATCH] fs : initialize return for iter_file_splice_write
From: Tom Rix <trix@...hat.com>
clang static analysis flags this garbarge return
fs/splice.c:786:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn]
return ret;
^~~~~~~~~~
ssize_t
iter_file_splice_write( ... size_t len, ..
sd.total_len = len
ssize_t ret;
while (sd.total_len) {
...
ret =
}
If the input len is 0, the while loop will never run and ret will
not be set.
So handle similar to splice_direct_to_actor and initialize ret to 0
Signed-off-by: Tom Rix <trix@...hat.com>
---
fs/splice.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/splice.c b/fs/splice.c
index d7c8a7c4db07..f65e072bcc2c 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -691,7 +691,7 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
int nbufs = pipe->max_usage;
struct bio_vec *array = kcalloc(nbufs, sizeof(struct bio_vec),
GFP_KERNEL);
- ssize_t ret;
+ ssize_t ret = 0;
if (unlikely(!array))
return -ENOMEM;
--
2.18.1
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