| Message ID | 20221022073521.1660841-2-zhangxiaoxu5@huawei.com |
|---|---|
| State | New |
| Headers | show |
| Series | Fix memory and page leak when writedata alloc failed | expand |
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 5b3b308e115c..87be0223a57a 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -3299,6 +3299,9 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from, cifs_uncached_writev_complete); if (!wdata) { rc = -ENOMEM; + for (i = 0; i < nr_pages; i++) + put_page(pagevec[i]); + kvfree(pagevec); add_credits_and_wake_if(server, credits, 0); break; }
There is a kmemleak when writedata alloc failed: unreferenced object 0xffff888175ae4000 (size 4096): comm "dd", pid 19419, jiffies 4296028749 (age 739.396s) hex dump (first 32 bytes): 80 02 b0 04 00 ea ff ff c0 02 b0 04 00 ea ff ff ................ 80 22 4c 04 00 ea ff ff c0 22 4c 04 00 ea ff ff ."L......"L..... backtrace: [<0000000072fdbb86>] __kmalloc_node+0x50/0x150 [<0000000039faf56f>] __iov_iter_get_pages_alloc+0x605/0xdd0 [<00000000f862a9d4>] iov_iter_get_pages_alloc2+0x3b/0x80 [<000000008f226067>] cifs_write_from_iter+0x2ae/0xe40 [<000000001f78f2f1>] __cifs_writev+0x337/0x5c0 [<00000000257fcef5>] vfs_write+0x503/0x690 [<000000008778a238>] ksys_write+0xb9/0x150 [<00000000ed82047c>] do_syscall_64+0x35/0x80 [<000000003365551d>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 __iov_iter_get_pages_alloc+0x605/0xdd0 is: want_pages_array at lib/iov_iter.c:1304 (inlined by) __iov_iter_get_pages_alloc at lib/iov_iter.c:1457 If writedata allocate failed, the pages and pagevec should be cleanup. Fixes: 8c5f9c1ab7cb ("CIFS: Add support for direct I/O write") Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com> --- fs/cifs/file.c | 3 +++ 1 file changed, 3 insertions(+)