open_and_lseek() increases the file size when the file is opened in write mode and scrolled past the files end. This fails badly on /dev/mem because loff_t which we use for the file size is signed variable, which is used as an unsigned variable in /dev/mem. To catch this case do not try to truncate FILE_SIZE_STREAM sized files. Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> --- fs/fs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/fs.c b/fs/fs.c index c5b17e158a..1374286e62 100644 --- a/fs/fs.c +++ b/fs/fs.c @@ -213,6 +213,9 @@ int ftruncate(int fd, loff_t length) f = &files[fd]; + if (f->size == FILE_SIZE_STREAM) + return 0; + fsdrv = f->fsdev->driver; ret = fsdrv->truncate(&f->fsdev->dev, f, length); -- 2.20.1 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
