| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 063/108] kernfs: fix regression in kernfs_fop_write caused by wrong type | Date | Thu, 15 Feb 2018 16:17:00 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Ivan Vecera <ivecera@redhat.com>
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>
--- fs/kernfs/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/kernfs/file.c +++ b/fs/kernfs/file.c @@ -272,7 +272,7 @@ static ssize_t kernfs_fop_write(struct f { 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) {
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