diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/base.c | 29 |
1 files changed, 12 insertions, 17 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index ef3f7df50023..159abd09b411 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -261,9 +261,10 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf, * Inherently racy -- command line shares address space * with code and data. */ - rv = access_remote_vm(mm, arg_end - 1, &c, 1, FOLL_ANON); - if (rv <= 0) + if (access_remote_vm(mm, arg_end - 1, &c, 1, FOLL_ANON) != 1) { + rv = 0; goto out_free_page; + } rv = 0; @@ -275,14 +276,11 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf, p = arg_start + *pos; len = len1 - *pos; while (count > 0 && len > 0) { - unsigned int _count; - int nr_read; - - _count = min3(count, len, PAGE_SIZE); - nr_read = access_remote_vm(mm, p, page, _count, FOLL_ANON); - if (nr_read < 0) - rv = nr_read; - if (nr_read <= 0) + unsigned int nr_read; + + nr_read = min3(count, len, PAGE_SIZE); + nr_read = access_remote_vm(mm, p, page, nr_read, FOLL_ANON); + if (nr_read == 0) goto out_free_page; if (copy_to_user(buf, page, nr_read)) { @@ -320,15 +318,12 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf, p = cmdline[i].p + pos1; len = cmdline[i].len - pos1; while (count > 0 && len > 0) { - unsigned int _count, l; - int nr_read; + unsigned int nr_read, l; bool final; - _count = min3(count, len, PAGE_SIZE); - nr_read = access_remote_vm(mm, p, page, _count, FOLL_ANON); - if (nr_read < 0) - rv = nr_read; - if (nr_read <= 0) + nr_read = min3(count, len, PAGE_SIZE); + nr_read = access_remote_vm(mm, p, page, nr_read, FOLL_ANON); + if (nr_read == 0) goto out_free_page; /* |