[PATCH] Fix memory leak in vc_resize/vc_allocate

From: Catalin Marinas
Date: Thu Aug 10 2006 - 10:20:10 EST

From: Catalin Marinas <catalin.marinas@xxxxxxx>

Memory leaks can happen in the vc_resize() function in drivers/char/vt.c
because of the vc->vc_screenbuf variable overriding in vc_allocate(). The
kmemleak reported trace is as follows:


This patch no longer allocates a screen buffer in vc_allocate() if it was
already allocated by vc_resize().

Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>

drivers/char/vt.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index da7e66a..31c8b32 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -730,7 +730,8 @@ int vc_allocate(unsigned int currcons) /
visual_init(vc, currcons, 1);
if (!*vc->vc_uni_pagedir_loc)
- vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
+ if (!vc->vc_kmalloced)
+ vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
if (!vc->vc_screenbuf) {
vc_cons[currcons].d = NULL;
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/