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authorPaul Jackson <pj@sgi.com>2005-09-28 06:42:24 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-28 07:58:51 -0700
commit5134fc15b643dc36eb9aa77e4318b886844a9ac5 (patch)
tree170339651303da0bb530c407300f09d3cd39caa2
parent2dd3c1df95fb29e9227f16ccd7d786d129e2b34d (diff)
downloadlinux-5134fc15b643dc36eb9aa77e4318b886844a9ac5.tar.bz2
[PATCH] cpuset read past eof memory leak fix
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>
-rw-r--r--kernel/cpuset.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 79866bc6b3a1..6a6e87b2f2fd 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -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: