4.104.114.84.95
Last change
on this file since ee733965 was
2d733c42,
checked in by Joel Sherrill <joel.sherrill@…>, on 01/20/99 at 15:48:22
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More general fix based on bug report and patch from Ian Lance Taylor
<ian@…> to fix this problem:
There is a small bug in rtems_close in c/src/lib/libc/libio.c. It
does not check whether the file descriptor it is passed is open. This
can cause it to make a null dereference if it is passed a file
descriptor which is in the valid range but which was not opened, or
which was already closed.
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-
Property mode set to
100644
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File size:
1.4 KB
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Line | |
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1 | /* |
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2 | * close() - POSIX 1003.1b 6.3.1 - Close a File |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1998. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * Copyright assigned to U.S. Government, 1994. |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #include "libio_.h" |
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16 | |
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17 | int close( |
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18 | int fd |
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19 | ) |
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20 | { |
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21 | rtems_libio_t *iop; |
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22 | rtems_status_code rc; |
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23 | int status; |
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24 | |
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25 | rtems_libio_check_fd(fd); |
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26 | iop = rtems_libio_iop(fd); |
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27 | rtems_libio_check_is_open(iop); |
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28 | if ( iop->flags & LIBIO_FLAGS_HANDLER_MASK ) { |
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29 | int (*fp)(int fd); |
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30 | |
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31 | fp = rtems_libio_handlers[ |
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32 | (iop->flags >> LIBIO_FLAGS_HANDLER_SHIFT) - 1].close; |
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33 | if ( fp == NULL ) |
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34 | set_errno_and_return_minus_one( EBADF ); |
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35 | status = (*fp)( fd ); |
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36 | return status; |
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37 | } |
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38 | |
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39 | if ( !iop->handlers ) |
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40 | set_errno_and_return_minus_one( EBADF ); |
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41 | |
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42 | if ( !iop->handlers->close ) |
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43 | set_errno_and_return_minus_one( ENOTSUP ); |
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44 | |
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45 | rc = (*iop->handlers->close)( iop ); |
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46 | |
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47 | rtems_libio_free( iop ); |
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48 | |
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49 | if (rc != RTEMS_SUCCESSFUL) |
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50 | set_errno_and_return_minus_one( rc ); |
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51 | |
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52 | return rc; |
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53 | } |
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54 | |
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55 | /* |
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56 | * _close_r |
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57 | * |
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58 | * This is the Newlib dependent reentrant version of close(). |
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59 | */ |
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60 | |
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61 | #if defined(RTEMS_NEWLIB) |
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62 | |
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63 | #include <reent.h> |
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64 | |
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65 | int _close_r( |
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66 | struct _reent *ptr, |
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67 | int fd |
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68 | ) |
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69 | { |
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70 | return close( fd ); |
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71 | } |
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72 | #endif |
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