diff options
Diffstat (limited to 'kernel/fail_function.c')
| -rw-r--r-- | kernel/fail_function.c | 33 |
1 files changed, 14 insertions, 19 deletions
diff --git a/kernel/fail_function.c b/kernel/fail_function.c index 63b349168da7..a7ccd2930c5f 100644 --- a/kernel/fail_function.c +++ b/kernel/fail_function.c @@ -37,9 +37,7 @@ static unsigned long adjust_error_retval(unsigned long addr, unsigned long retv) { switch (get_injectable_error_type(addr)) { case EI_ETYPE_NULL: - if (retv != 0) - return 0; - break; + return 0; case EI_ETYPE_ERRNO: if (retv < (unsigned long)-MAX_ERRNO) return (unsigned long)-EINVAL; @@ -48,6 +46,8 @@ static unsigned long adjust_error_retval(unsigned long addr, unsigned long retv) if (retv != 0 && retv < (unsigned long)-MAX_ERRNO) return (unsigned long)-EINVAL; break; + case EI_ETYPE_TRUE: + return 1; } return retv; @@ -247,15 +247,11 @@ static ssize_t fei_write(struct file *file, const char __user *buffer, /* cut off if it is too long */ if (count > KSYM_NAME_LEN) count = KSYM_NAME_LEN; - buf = kmalloc(count + 1, GFP_KERNEL); - if (!buf) - return -ENOMEM; - if (copy_from_user(buf, buffer, count)) { - ret = -EFAULT; - goto out; - } - buf[count] = '\0'; + buf = memdup_user_nul(buffer, count); + if (IS_ERR(buf)) + return PTR_ERR(buf); + sym = strstrip(buf); mutex_lock(&fei_lock); @@ -298,17 +294,16 @@ static ssize_t fei_write(struct file *file, const char __user *buffer, } ret = register_kprobe(&attr->kp); - if (!ret) - fei_debugfs_add_attr(attr); - if (ret < 0) - fei_attr_remove(attr); - else { - list_add_tail(&attr->list, &fei_attr_list); - ret = count; + if (ret) { + fei_attr_free(attr); + goto out; } + fei_debugfs_add_attr(attr); + list_add_tail(&attr->list, &fei_attr_list); + ret = count; out: - kfree(buf); mutex_unlock(&fei_lock); + kfree(buf); return ret; } |