diff options
Diffstat (limited to 'fs/fs.c')
| -rw-r--r-- | fs/fs.c | 34 |
1 files changed, 34 insertions, 0 deletions
@@ -229,6 +229,16 @@ static void put_file(FILE *f) files[f->no].in_use = 0; } +static int check_fd(int fd) +{ + if (fd < 0 || fd >= MAX_FILES || !files[fd].in_use) { + errno = -EBADF; + return errno; + } + + return 0; +} + static struct device_d *get_fs_device_by_path(char **path) { struct device_d *dev; @@ -457,6 +467,9 @@ int ioctl(int fd, int request, void *buf) struct fs_driver_d *fsdrv; FILE *f = &files[fd]; + if (check_fd(fd)) + return errno; + dev = f->dev; fsdrv = (struct fs_driver_d *)dev->driver->type_data; @@ -474,6 +487,9 @@ int read(int fd, void *buf, size_t count) struct fs_driver_d *fsdrv; FILE *f = &files[fd]; + if (check_fd(fd)) + return errno; + dev = f->dev; fsdrv = (struct fs_driver_d *)dev->driver->type_data; @@ -494,6 +510,9 @@ ssize_t write(int fd, const void *buf, size_t count) struct fs_driver_d *fsdrv; FILE *f = &files[fd]; + if (check_fd(fd)) + return errno; + dev = f->dev; fsdrv = (struct fs_driver_d *)dev->driver->type_data; @@ -524,6 +543,9 @@ off_t lseek(int fildes, off_t offset, int whence) FILE *f = &files[fildes]; off_t pos; + if (check_fd(fildes)) + return -1; + errno = 0; dev = f->dev; @@ -567,6 +589,9 @@ int erase(int fd, size_t count, unsigned long offset) struct fs_driver_d *fsdrv; FILE *f = &files[fd]; + if (check_fd(fd)) + return errno; + dev = f->dev; fsdrv = (struct fs_driver_d *)dev->driver->type_data; @@ -589,6 +614,9 @@ int protect(int fd, size_t count, unsigned long offset, int prot) struct fs_driver_d *fsdrv; FILE *f = &files[fd]; + if (check_fd(fd)) + return errno; + dev = f->dev; fsdrv = (struct fs_driver_d *)dev->driver->type_data; @@ -627,6 +655,9 @@ void *memmap(int fd, int flags) FILE *f = &files[fd]; void *ret = (void *)-1; + if (check_fd(fd)) + return ret; + dev = f->dev; fsdrv = (struct fs_driver_d *)dev->driver->type_data; @@ -646,6 +677,9 @@ int close(int fd) struct fs_driver_d *fsdrv; FILE *f = &files[fd]; + if (check_fd(fd)) + return errno; + dev = f->dev; fsdrv = (struct fs_driver_d *)dev->driver->type_data; |