| From 0a6a6d88ae2622e7cf2793f511b73c17ada547f7 Mon Sep 17 00:00:00 2001 |
| From: Shuxiao Zhang <zhangshuxiao@xiaomi.com> |
| Date: Thu, 6 Apr 2017 22:30:29 +0800 |
| Subject: [PATCH] staging: android: ashmem: lseek failed due to no FMODE_LSEEK. |
| |
| commit 97fbfef6bd597888485b653175fb846c6998b60c upstream. |
| |
| vfs_llseek will check whether the file mode has |
| FMODE_LSEEK, no return failure. But ashmem can be |
| lseek, so add FMODE_LSEEK to ashmem file. |
| |
| Comment From Greg Hackmann: |
| ashmem_llseek() passes the llseek() call through to the backing |
| shmem file. 91360b02ab48 ("ashmem: use vfs_llseek()") changed |
| this from directly calling the file's llseek() op into a VFS |
| layer call. This also adds a check for the FMODE_LSEEK bit, so |
| without that bit ashmem_llseek() now always fails with -ESPIPE. |
| |
| Fixes: 91360b02ab48 ("ashmem: use vfs_llseek()") |
| Signed-off-by: Shuxiao Zhang <zhangshuxiao@xiaomi.com> |
| Tested-by: Greg Hackmann <ghackmann@google.com> |
| Cc: stable <stable@vger.kernel.org> # 3.18+ |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> |
| |
| diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c |
| index ca9a53c03f0f..2b770cb0c488 100644 |
| --- a/drivers/staging/android/ashmem.c |
| +++ b/drivers/staging/android/ashmem.c |
| @@ -405,6 +405,7 @@ static int ashmem_mmap(struct file *file, struct vm_area_struct *vma) |
| ret = PTR_ERR(vmfile); |
| goto out; |
| } |
| + vmfile->f_mode |= FMODE_LSEEK; |
| asma->file = vmfile; |
| } |
| get_file(asma->file); |
| -- |
| 2.12.0 |
| |
