3.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Carpenter <dan.carpen...@oracle.com>
commit a497e47d4aec37aaf8f13509f3ef3d1f6a717d88 upstream.
If we do a zero size allocation then it will oops. Also we can't be
sure the user passes us a NUL terminated string so I've added a
terminator.
This code can only be triggered by root.
Reported-by: Nico Golde <n...@ngolde.de>
Reported-by: Fabian Yamaguchi <f...@goesec.de>
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Acked-by: Dan Williams <d...@redhat.com>
Signed-off-by: John W. Linville <linvi...@tuxdriver.com>
Cc: Kees Cook <keesc...@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/net/wireless/libertas/debugfs.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/net/wireless/libertas/debugfs.c
+++ b/drivers/net/wireless/libertas/debugfs.c
@@ -913,7 +913,10 @@ static ssize_t lbs_debugfs_write(struct
char *p2;
struct debug_data *d = f->private_data;
- pdata = kmalloc(cnt, GFP_KERNEL);
+ if (cnt == 0)
+ return 0;
+
+ pdata = kmalloc(cnt + 1, GFP_KERNEL);
if (pdata == NULL)
return 0;
@@ -922,6 +925,7 @@ static ssize_t lbs_debugfs_write(struct
kfree(pdata);
return 0;
}
+ pdata[cnt] = '\0';
p0 = pdata;
for (i = 0; i < num_of_items; i++) {
--
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