aboutsummaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
authorMikulas Patocka <mpatocka@redhat.com>2009-01-30 15:27:14 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-31 18:51:31 -0500
commit878b8619f711280fd05845e21956434b5e588cc4 (patch)
treee2cb6be1d6e16bd0da18a79a8a85f4194df33d6f /drivers
parentf984d024190d5df98e448e35aa9e89a46fe50bb9 (diff)
Fix memory corruption in console selection
Fix an off-by-two memory error in console selection. The loop below goes from sel_start to sel_end (inclusive), so it writes one more character. This one more character was added to the allocated size (+1), but it was not multiplied by an UTF-8 multiplier. This patch fixes a memory corruption when UTF-8 console is used and the user selects a few characters, all of them 3-byte in UTF-8 (for example a frame line). When memory redzones are enabled, a redzone corruption is reported. When they are not enabled, trashing of random memory occurs. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/selection.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/selection.c b/drivers/char/selection.c
index f29fbe9b8ed7..cb8ca5698963 100644
--- a/drivers/char/selection.c
+++ b/drivers/char/selection.c
@@ -268,7 +268,7 @@ int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *t
268 268
269 /* Allocate a new buffer before freeing the old one ... */ 269 /* Allocate a new buffer before freeing the old one ... */
270 multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */ 270 multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */
271 bp = kmalloc((sel_end-sel_start)/2*multiplier+1, GFP_KERNEL); 271 bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL);
272 if (!bp) { 272 if (!bp) {
273 printk(KERN_WARNING "selection: kmalloc() failed\n"); 273 printk(KERN_WARNING "selection: kmalloc() failed\n");
274 clear_selection(); 274 clear_selection();