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authorAntonino A. Daplas <adaplas@gmail.com>2005-09-15 21:34:33 +0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-15 08:24:09 -0700
commit065d9cac98a5406ecd5a1368f8fd38f55739dee9 (patch)
tree07ee4a0bf1eba87e704073bd95bac25022cb5a52
parent6d36ba629e0ef47a03d3703ee1d38143c25532a8 (diff)
[PATCH] vc: Use correct size on buffer copy in vc_resize
In the unlikely case of the new screen width much wider then the old, use (old_row_size * new_rows) instead of new_screen_size to prevent a buffer overrun during the copy. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/char/vt.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 1e33cb032e07..e91268e86833 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -810,13 +810,14 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
* from the top and bottom of cursor position
*/
old_origin += (vc->vc_y - new_rows/2) * old_row_size;
- end = old_origin + new_screen_size;
+ end = old_origin + (old_row_size * new_rows);
}
} else
/*
* Cursor near the top, copy contents from the top of buffer
*/
- end = (old_rows > new_rows) ? old_origin + new_screen_size :
+ end = (old_rows > new_rows) ? old_origin +
+ (old_row_size * new_rows) :
vc->vc_scr_end;
update_attr(vc);

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