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| author |   Russell King <rmk+kernel@arm.linux.org.uk> | 2009-10-12 14:38:08 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-10-12 14:38:08 +0100 |
| commit | edc72786d208e77db94f84dcb0d166c0d23d82f7 (patch) | |
| tree | 6fd32770f9cb2f1a888775514294d60aecba5245 /arch/x86/kernel/cpu/mtrr/if.c | |
| parent | ARM: Add kmap_atomic type debugging (diff) | |
| parent | [ARM] pxa: workaround errata #37 by not using half turbo switching (diff) | |
| download | linux-dev-edc72786d208e77db94f84dcb0d166c0d23d82f7.tar.xz linux-dev-edc72786d208e77db94f84dcb0d166c0d23d82f7.zip | |
Merge branch 'fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6
Diffstat (limited to 'arch/x86/kernel/cpu/mtrr/if.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mtrr/if.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c index f04e72527604..3c1b12d461d1 100644 --- a/arch/x86/kernel/cpu/mtrr/if.c +++ b/arch/x86/kernel/cpu/mtrr/if.c @@ -96,17 +96,24 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos) unsigned long long base, size; char *ptr; char line[LINE_SIZE]; + int length; size_t linelen; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (!len) - return -EINVAL; memset(line, 0, LINE_SIZE); - if (len > LINE_SIZE) - len = LINE_SIZE; - if (copy_from_user(line, buf, len - 1)) + + length = len; + length--; + + if (length > LINE_SIZE - 1) + length = LINE_SIZE - 1; + + if (length < 0) + return -EINVAL; + + if (copy_from_user(line, buf, length)) return -EFAULT; linelen = strlen(line); |