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| author | Ivan Vecera <ivecera@redhat.com> | 2018-01-19 09:18:54 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-16 20:14:44 +0100 |
| commit | 0b72648a13f1b6a793779b4f31d54510156c168e (patch) | |
| tree | 8f536bdad53c7a8e962041f607070ae123e6c71a /fs | |
| parent | 103fa74ffa5247439cbdae65c8aaec8e62ef3a05 (diff) | |
| download | linux-stable-0b72648a13f1b6a793779b4f31d54510156c168e.tar.gz linux-stable-0b72648a13f1b6a793779b4f31d54510156c168e.tar.bz2 linux-stable-0b72648a13f1b6a793779b4f31d54510156c168e.zip | |
kernfs: fix regression in kernfs_fop_write caused by wrong type
commit ba87977a49913129962af8ac35b0e13e0fa4382d upstream.
Commit b7ce40cff0b9 ("kernfs: cache atomic_write_len in
kernfs_open_file") changes type of local variable 'len' from ssize_t
to size_t. This change caused that the *ppos value is updated also
when the previous write callback failed.
Mentioned snippet:
...
len = ops->write(...); <- return value can be negative
...
if (len > 0) <- true here in this case
*ppos += len;
...
Fixes: b7ce40cff0b9 ("kernfs: cache atomic_write_len in kernfs_open_file")
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/kernfs/file.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c index efb1f7b5883e..4779f47ecad2 100644 --- a/fs/kernfs/file.c +++ b/fs/kernfs/file.c @@ -267,7 +267,7 @@ static ssize_t kernfs_fop_write(struct file *file, const char __user *user_buf, { struct kernfs_open_file *of = kernfs_of(file); const struct kernfs_ops *ops; - size_t len; + ssize_t len; char *buf; if (of->atomic_write_len) { |