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authorQian Cai <cai@redhat.com>2020-10-01 08:50:55 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2020-10-01 09:40:35 -0400
commit8a018eb55e3ac033592afbcb476b0ffe64465b12 (patch)
treebd8bac805f42321871049858655790092ea623ae /fs/pipe.c
parent933a3752babcf6513117d5773d2b70782d6ad149 (diff)
downloadlinux-8a018eb55e3ac033592afbcb476b0ffe64465b12.tar.bz2
pipe: Fix memory leaks in create_pipe_files()
Calling pipe2() with O_NOTIFICATION_PIPE could results in memory leaks unless watch_queue_init() is successful. In case of watch_queue_init() failure in pipe2() we are left with inode and pipe_inode_info instances that need to be freed. That failure exit has been introduced in commit c73be61cede5 ("pipe: Add general notification queue support") and its handling should've been identical to nearby treatment of alloc_file_pseudo() failures - it is dealing with the same situation. As it is, the mainline kernel leaks in that case. Another problem is that CONFIG_WATCH_QUEUE and !CONFIG_WATCH_QUEUE cases are treated differently (and the former leaks just pipe_inode_info, the latter - both pipe_inode_info and inode). Fixed by providing a dummy wacth_queue_init() in !CONFIG_WATCH_QUEUE case and by having failures of wacth_queue_init() handled the same way we handle alloc_file_pseudo() ones. Fixes: c73be61cede5 ("pipe: Add general notification queue support") Signed-off-by: Qian Cai <cai@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/pipe.c')
-rw-r--r--fs/pipe.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index 60dbee457143..f5d74ba1bf8c 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -913,19 +913,18 @@ int create_pipe_files(struct file **res, int flags)
{
struct inode *inode = get_pipe_inode();
struct file *f;
+ int error;
if (!inode)
return -ENFILE;
if (flags & O_NOTIFICATION_PIPE) {
-#ifdef CONFIG_WATCH_QUEUE
- if (watch_queue_init(inode->i_pipe) < 0) {
+ error = watch_queue_init(inode->i_pipe);
+ if (error) {
+ free_pipe_info(inode->i_pipe);
iput(inode);
- return -ENOMEM;
+ return error;
}
-#else
- return -ENOPKG;
-#endif
}
f = alloc_file_pseudo(inode, pipe_mnt, "",