From 2f7c68cb55ecb7331f2381deb497c27155f32faf Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 03 Jan 2024 09:43:39 +0000
Subject: [PATCH] update kernel to 5.10.198
---
kernel/drivers/tty/vt/vc_screen.c | 25 ++++++++++++++++---------
1 files changed, 16 insertions(+), 9 deletions(-)
diff --git a/kernel/drivers/tty/vt/vc_screen.c b/kernel/drivers/tty/vt/vc_screen.c
index 1850bac..01c9653 100644
--- a/kernel/drivers/tty/vt/vc_screen.c
+++ b/kernel/drivers/tty/vt/vc_screen.c
@@ -386,10 +386,6 @@
uni_mode = use_unicode(inode);
attr = use_attributes(inode);
- ret = -ENXIO;
- vc = vcs_vc(inode, &viewed);
- if (!vc)
- goto unlock_out;
ret = -EINVAL;
if (pos < 0)
@@ -407,16 +403,20 @@
unsigned int this_round, skip = 0;
int size;
+ vc = vcs_vc(inode, &viewed);
+ if (!vc) {
+ ret = -ENXIO;
+ 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;
+ break;
}
if (pos >= size)
break;
@@ -656,10 +656,17 @@
}
}
- /* The vcs_size might have changed while we slept to grab
- * the user buffer, so recheck.
+ /* The vc might have been freed or vcs_size might have changed
+ * while we slept to grab the user buffer, so recheck.
* Return data written up to now on failure.
*/
+ vc = vcs_vc(inode, &viewed);
+ if (!vc) {
+ if (written)
+ break;
+ ret = -ENXIO;
+ goto unlock_out;
+ }
size = vcs_size(vc, attr, false);
if (size < 0) {
if (written)
--
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