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| author | Kumar Amit Mehta <gmate.amit@gmail.com> | 2012-11-23 01:16:35 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-26 16:07:01 -0800 |
| commit | d53c57dca2ccb540cceb0b1a228f11e1325cecde (patch) | |
| tree | 7313040ccf9000665d6a26c565754ea571e4682a | |
| parent | 3ba89e96610b85b5a2f3a146f65342e38af27a79 (diff) | |
| download | linux-d53c57dca2ccb540cceb0b1a228f11e1325cecde.tar.gz linux-d53c57dca2ccb540cceb0b1a228f11e1325cecde.tar.bz2 linux-d53c57dca2ccb540cceb0b1a228f11e1325cecde.zip | |
staging: dgrp: dgrp_tty.c: Audit the return values of get/put_user()
fix for missing audits for return values of get_user() and put_user().
Inspecting the return values of get/put_user() would make the access_ok()
redundant, hence removing calls to access_ok() in such scenarios.
Signed-off-by: Kumar Amit Mehta <gmate.amit@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/dgrp/dgrp_tty.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/drivers/staging/dgrp/dgrp_tty.c b/drivers/staging/dgrp/dgrp_tty.c index 5796de8ddbe4..5647068b9385 100644 --- a/drivers/staging/dgrp/dgrp_tty.c +++ b/drivers/staging/dgrp/dgrp_tty.c @@ -2265,9 +2265,7 @@ static int get_modem_info(struct ch_struct *ch, unsigned int *value) | ((mlast & DM_RI) ? TIOCM_RNG : 0) | ((mlast & DM_DSR) ? TIOCM_DSR : 0) | ((mlast & DM_CTS) ? TIOCM_CTS : 0); - put_user(mlast, (unsigned int __user *) value); - - return 0; + return put_user(mlast, (unsigned int __user *) value); } /* @@ -2285,7 +2283,8 @@ static int set_modem_info(struct ch_struct *ch, unsigned int command, if (error == 0) return -EFAULT; - get_user(arg, (unsigned int __user *) value); + if (get_user(arg, (unsigned int __user *) value)) + return -EFAULT; mval |= ((arg & TIOCM_RTS) ? DM_RTS : 0) | ((arg & TIOCM_DTR) ? DM_DTR : 0); @@ -2616,12 +2615,8 @@ static int dgrp_tty_ioctl(struct tty_struct *tty, unsigned int cmd, return 0; case TIOCGSOFTCAR: - rc = access_ok(VERIFY_WRITE, (void __user *) arg, - sizeof(long)); - if (rc == 0) - return -EFAULT; - put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) arg); - return 0; + return put_user(C_CLOCAL(tty) ? 1 : 0, + (unsigned long __user *) arg); case TIOCMGET: rc = access_ok(VERIFY_WRITE, (void __user *) arg, @@ -2844,17 +2839,16 @@ static int dgrp_tty_ioctl(struct tty_struct *tty, unsigned int cmd, break; case DIGI_GETCUSTOMBAUD: - rc = access_ok(VERIFY_WRITE, (void __user *) arg, sizeof(int)); - if (rc == 0) + if (put_user(ch->ch_custom_speed, (unsigned int __user *) arg)) return -EFAULT; - put_user(ch->ch_custom_speed, (unsigned int __user *) arg); break; case DIGI_SETCUSTOMBAUD: { int new_rate; - get_user(new_rate, (unsigned int __user *) arg); + if (get_user(new_rate, (unsigned int __user *) arg)) + return -EFAULT; dgrp_set_custom_speed(ch, new_rate); break; |