diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-01-30 15:27:14 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-02-06 13:47:19 -0800 |
| commit | 8255fc826e58c0a59711029e01db9fcdc06ba211 (patch) | |
| tree | 1ee915fe5da639d313ee48271bc93ec037a2f49d | |
| parent | 8550890004fb0220bef61604d82a96fb183e2b82 (diff) | |
Fix memory corruption in console selection
commit 878b8619f711280fd05845e21956434b5e588cc4 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/char/selection.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/selection.c b/drivers/char/selection.c index 2978a49a172b..caf3fa278dc9 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 /* Allocate a new buffer before freeing the old one ... */ multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */ - bp = kmalloc((sel_end-sel_start)/2*multiplier+1, GFP_KERNEL); + bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL); if (!bp) { printk(KERN_WARNING "selection: kmalloc() failed\n"); clear_selection(); |