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vc_screen: modify vcs_size() handling in vcs_read()

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[ Upstream commit 46d733d0efc79bc8430d63b57ab88011806d5180 ]

Restore the vcs_size() handling in vcs_read() to what
it had been in previous version.

Fixes: 226fae124b2d ("vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF")
Suggested-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: George Kennedy <george.kennedy@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
George Kennedy
2023-02-27 15:21:41 -05:00
committed by Greg Kroah-Hartman
parent ac73d8f6a6
commit 3e734e6941
1 changed files with 1 additions and 3 deletions
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4
drivers/tty/vt/vc_screen.c
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@@ -415,10 +415,8 @@ vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
*/
size = vcs_size(vc, attr, uni_mode);
if (size < 0) {
if (read)
break;
ret = size;
goto unlock_out;
break;
}
if (pos >= size)
break;