Do similar checks as it has been done in vfs_read for the aio_write callback. ext4 for example does not provide aio_write callback causing NULL pointer dereference in do_sync_write() without this check.
Signed-off-by: Peter Ujfalusi <[email protected]> --- fs/read_write.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index b6336a54f70d..009d8542a889 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -500,8 +500,10 @@ ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t count = MAX_RW_COUNT; if (file->f_op->write) ret = file->f_op->write(file, p, count, pos); - else + else if (file->f_op->aio_write) ret = do_sync_write(file, p, count, pos); + else + ret = new_sync_write(file, p, count, pos); set_fs(old_fs); if (ret > 0) { fsnotify_modify(file); @@ -528,8 +530,10 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_ file_start_write(file); if (file->f_op->write) ret = file->f_op->write(file, buf, count, pos); - else + else if (file->f_op->aio_write) ret = do_sync_write(file, buf, count, pos); + else + ret = new_sync_write(file, buf, count, pos); if (ret > 0) { fsnotify_modify(file); add_wchar(current, ret); -- 1.9.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
