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authorLinus Torvalds <torvalds@linux-foundation.org>2011-04-18 10:36:54 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-04-21 14:32:53 -0700
commita506a5b9282e4b944ed314d2b30ce387c44ff9fe (patch)
tree3f132b8344f0fbefb1739d4e049fd166426702e3 /fs
parentc8b265db1e63fdb296ec2721f5c1473c44bc4dc5 (diff)
proc: do proper range check on readdir offset
commit d8bdc59f215e62098bc5b4256fd9928bf27053a1 upstream. Rather than pass in some random truncated offset to the pid-related functions, check that the offset is in range up-front. This is just cleanup, the previous commit fixed the real problem. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/base.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index d49c4b5d2c3..71a85d80f83 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3066,11 +3066,16 @@ static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldi
/* for the /proc/ directory itself, after non-process stuff has been done */
int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
{
- unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
- struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode);
+ unsigned int nr;
+ struct task_struct *reaper;
struct tgid_iter iter;
struct pid_namespace *ns;
+ if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
+ goto out_no_task;
+ nr = filp->f_pos - FIRST_PROCESS_ENTRY;
+
+ reaper = get_proc_task(filp->f_path.dentry->d_inode);
if (!reaper)
goto out_no_task;