If vcs_vc() returns NULL in vcs_read(), break from while loop if partial
read, else if no reads have been done, go to unlock_out and return -ENXIO.
In addition, change the goto unlock_out after vcs_size() to a break
to conform to the break handling after vcs_vc().
Fixes: ac751efa6a0d ("console: rename acquire/release_console_sem() to console_lock/unlock()")
Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: George Kennedy <george.kennedy@xxxxxxxxxx>
---
drivers/tty/vt/vc_screen.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c
index f566eb1839dc..c599b452969f 100644
--- a/drivers/tty/vt/vc_screen.c
+++ b/drivers/tty/vt/vc_screen.c
@@ -406,19 +406,17 @@ vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
ret = -ENXIO;
vc = vcs_vc(inode, &viewed);
if (!vc)
- goto unlock_out;
+ break;
/* Check whether we are above size each round,
* as copy_to_user at the end of this loop
* could sleep.
*/
- size = vcs_size(vc, attr, uni_mode);
- if (size < 0) {
- if (read)
- break;
- ret = size;
- goto unlock_out;
- }
+ ret = vcs_size(vc, attr, uni_mode);
+ if (ret < 0)
+ break;
+ size = ret;
+ ret = 0;
if (pos >= size)
break;
if (count > size - pos)
--
2.31.1
