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[PATCH] cpuset read past eof memory leak fix

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Don't leak a page of memory if user reads a cpuset file past eof.

Signed-off-by: KUROSAWA Takahiro <kurosawa@valinux.co.jp>
Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul Jackson 2005-09-28 06:42:24 -07:00 committed by Linus Torvalds
parent 2dd3c1df95
commit 5134fc15b6
1 changed files with 6 additions and 5 deletions
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11
kernel/cpuset.c
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@ -969,7 +969,7 @@ static ssize_t cpuset_common_file_read(struct file *file, char __user *buf,
ssize_t retval = 0;
char *s;
char *start;
size_t n;
ssize_t n;
if (!(page = (char *)__get_free_page(GFP_KERNEL)))
return -ENOMEM;
@ -999,12 +999,13 @@ static ssize_t cpuset_common_file_read(struct file *file, char __user *buf,
*s++ = '\n';
*s = '\0';
/* Do nothing if *ppos is at the eof or beyond the eof. */
if (s - page <= *ppos)
return 0;
start = page + *ppos;
n = s - start;
/* Do nothing if *ppos is at the eof or beyond the eof. */
if (n <= 0)
goto out;
retval = n - copy_to_user(buf, start, min(n, nbytes));
*ppos += retval;
out: