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Subject[PATCH v2] pipe: Fix memory leaks in create_pipe_files()
Date
Calling pipe2() with O_NOTIFICATION_PIPE could results in memory leaks
in an error path or CONFIG_WATCH_QUEUE=n. Plug them.

unreferenced object 0xc00000141114a0d8 (size 992):
comm "trinity-c61", pid 1353192, jiffies 4296255779 (age 25989.560s)
hex dump (first 32 bytes):
80 11 00 00 e8 03 00 00 00 00 00 00 00 00 00 00 ................
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
backtrace:
[<00000000abff13d7>] kmem_cache_alloc+0x1b4/0x470
[<000000009502e5d5>] alloc_inode+0xd0/0x130
[<00000000ca1c1a21>] new_inode_pseudo+0x1c/0x80
new_inode_pseudo at fs/inode.c:932
[<000000000c01d1d6>] create_pipe_files+0x48/0x2d0
get_pipe_inode at fs/pipe.c:874
(inlined by) create_pipe_files at fs/pipe.c:914
[<00000000d13ff4c4>] __do_pipe_flags+0x50/0x120
__do_pipe_flags at fs/pipe.c:965
[<0000000003941e42>] do_pipe2+0x3c/0x100
do_pipe2 at fs/pipe.c:1013
[<00000000a006b818>] sys_pipe2+0x1c/0x30
__se_sys_pipe2 at fs/pipe.c:1028
[<00000000a6925b55>] system_call_exception+0xf8/0x1d0
[<000000001c6b0740>] system_call_common+0xe8/0x218
unreferenced object 0xc000001f575ce600 (size 512):
comm "trinity-c61", pid 1353192, jiffies 4296255779 (age 25989.560s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 ad 4e ad de .............N..
ff ff ff ff 00 00 00 00 ff ff ff ff ff ff ff ff ................
backtrace:
[<00000000d74d5e3a>] kmem_cache_alloc_trace+0x1c4/0x2d0
[<0000000061cbc9cb>] alloc_pipe_info+0x88/0x2c0
kmalloc at include/linux/slab.h:554
(inlined by) kzalloc at include/linux/slab.h:666
(inlined by) alloc_pipe_info at fs/pipe.c:793
[<00000000efd6129c>] create_pipe_files+0x6c/0x2d0
get_pipe_inode at fs/pipe.c:883
(inlined by) create_pipe_files at fs/pipe.c:914
[<00000000d13ff4c4>] __do_pipe_flags+0x50/0x120
[<0000000003941e42>] do_pipe2+0x3c/0x100
[<00000000a006b818>] sys_pipe2+0x1c/0x30
[<00000000a6925b55>] system_call_exception+0xf8/0x1d0
[<000000001c6b0740>] system_call_common+0xe8/0x218
unreferenced object 0xc000000d94f20400 (size 1024):
comm "trinity-c61", pid 1353192, jiffies 4296255779 (age 25989.560s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000e60ee00f>] __kmalloc+0x1e4/0x330
[<00000000130e8cc8>] alloc_pipe_info+0x154/0x2c0
kmalloc_array at include/linux/slab.h:594
(inlined by) kcalloc at include/linux/slab.h:605
(inlined by) alloc_pipe_info at fs/pipe.c:810
[<00000000efd6129c>] create_pipe_files+0x6c/0x2d0
[<00000000d13ff4c4>] __do_pipe_flags+0x50/0x120
[<0000000003941e42>] do_pipe2+0x3c/0x100
[<00000000a006b818>] sys_pipe2+0x1c/0x30
[<00000000a6925b55>] system_call_exception+0xf8/0x1d0
[<000000001c6b0740>] system_call_common+0xe8/0x218

Fixes: c73be61cede5 ("pipe: Add general notification queue support")
Signed-off-by: Qian Cai <cai@redhat.com>
---
fs/pipe.c | 11 +++++------
include/linux/watch_queue.h | 4 ++++
2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 60dbee457143..6fbfbb8f32e1 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 ret;

if (!inode)
return -ENFILE;

if (flags & O_NOTIFICATION_PIPE) {
-#ifdef CONFIG_WATCH_QUEUE
- if (watch_queue_init(inode->i_pipe) < 0) {
+ ret = watch_queue_init(inode->i_pipe);
+ if (ret < 0) {
+ free_pipe_info(inode->i_pipe);
iput(inode);
- return -ENOMEM;
+ return ret;
}
-#else
- return -ENOPKG;
-#endif
}

f = alloc_file_pseudo(inode, pipe_mnt, "",
diff --git a/include/linux/watch_queue.h b/include/linux/watch_queue.h
index 5e08db2adc31..20665fbe0552 100644
--- a/include/linux/watch_queue.h
+++ b/include/linux/watch_queue.h
@@ -123,5 +123,9 @@ static inline void remove_watch_list(struct watch_list *wlist, u64 id)
#define watch_sizeof(STRUCT) (sizeof(STRUCT) << WATCH_INFO_LENGTH__SHIFT)

#endif
+static inline int watch_queue_init(struct pipe_inode_info *pipe)
+{
+ return -ENOPKG;
+}

#endif /* _LINUX_WATCH_QUEUE_H */
--
2.28.0
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