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| author | Muhammad Falak R Wani <falakreyaz@gmail.com> | 2016-05-20 16:21:20 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-06-13 16:58:12 +0300 |
| commit | fd346c9dae6b266f8c3f62df20237059a3a90312 (patch) | |
| tree | 33658f9b194c4737d949e7a9e75b3d3181418679 /drivers/s390/char | |
| parent | 1c343f7b0e177e8ca7f4d4a5dd1fa790f85abbcc (diff) | |
| download | linux-fd346c9dae6b266f8c3f62df20237059a3a90312.tar.xz | |
s390/keyboard: use memdup_user_nul()
Use memdup_user_nul to duplicate a memory region from user-space
to kernel-space and terminate with a NULL, instead of open coding
using kmalloc + copy_from_user and explicitly NULL terminating.
Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
[heiko.carstens@de.ibm.com: remove comment]
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char')
| -rw-r--r-- | drivers/s390/char/keyboard.c | 15 |
1 files changed, 3 insertions, 12 deletions
diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c index ef04a9f7a704..7b9c50aa4cc9 100644 --- a/drivers/s390/char/keyboard.c +++ b/drivers/s390/char/keyboard.c @@ -438,18 +438,9 @@ do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs, return -EFAULT; if (len > sizeof(u_kbs->kb_string)) return -EINVAL; - p = kmalloc(len, GFP_KERNEL); - if (!p) - return -ENOMEM; - if (copy_from_user(p, u_kbs->kb_string, len)) { - kfree(p); - return -EFAULT; - } - /* - * Make sure the string is terminated by 0. User could have - * modified it between us running strnlen_user() and copying it. - */ - p[len - 1] = 0; + p = memdup_user_nul(u_kbs->kb_string, len); + if (IS_ERR(p)) + return PTR_ERR(p); kfree(kbd->func_table[kb_func]); kbd->func_table[kb_func] = p; break; |