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When checking if file descriptor number is valid, explicitely check for 'fd'

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being less than 0 instead of using cast-to-unsigned hack.

Today's commit was brought to you by the letters 'B', 'D' and 'E' :)
This commit is contained in:
Pawel Jakub Dawidek 2012-06-13 22:12:10 +00:00
parent eb55578582
commit 620216725a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=237036
3 changed files with 9 additions and 9 deletions
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14
sys/kern/kern_descrip.c
View File

@ -243,7 +243,7 @@ fd_last_used(struct filedesc *fdp, int size)
static int
fdisused(struct filedesc *fdp, int fd)
{
KASSERT((unsigned int)fd < fdp->fd_nfiles,
KASSERT(fd >= 0 && fd < fdp->fd_nfiles,
("file descriptor %d out of range (0, %d)", fd, fdp->fd_nfiles));
return ((fdp->fd_map[NDSLOT(fd)] & NDBIT(fd)) != 0);
}
@ -433,7 +433,7 @@ fdtofp(int fd, struct filedesc *fdp)
FILEDESC_LOCK_ASSERT(fdp);
if ((unsigned)fd >= fdp->fd_nfiles)
if (fd < 0 || fd >= fdp->fd_nfiles)
return (NULL);
return (fdp->fd_ofiles[fd]);
@ -677,7 +677,7 @@ kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
vfslocked = 0;
/* Check for race with close */
FILEDESC_SLOCK(fdp);
if ((unsigned) fd >= fdp->fd_nfiles ||
if (fd < 0 || fd >= fdp->fd_nfiles ||
fp != fdp->fd_ofiles[fd]) {
FILEDESC_SUNLOCK(fdp);
flp->l_whence = SEEK_SET;
@ -1197,7 +1197,7 @@ kern_close(td, fd)
AUDIT_SYSCLOSE(td, fd);
FILEDESC_XLOCK(fdp);
if ((unsigned)fd >= fdp->fd_nfiles ||
if (fd < 0 || fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL) {
FILEDESC_XUNLOCK(fdp);
return (EBADF);
@ -1500,7 +1500,7 @@ fdalloc(struct thread *td, int minfd, int *result)
* Perform some sanity checks, then mark the file descriptor as
* used and return it to the caller.
*/
KASSERT((unsigned int)fd < min(maxfd, fdp->fd_nfiles),
KASSERT(fd >= 0 && fd < min(maxfd, fdp->fd_nfiles),
("invalid descriptor %d", fd));
KASSERT(!fdisused(fdp, fd),
("fd_first_free() returned non-free descriptor"));
@ -2213,7 +2213,7 @@ fget_unlocked(struct filedesc *fdp, int fd)
struct file *fp;
u_int count;
if ((unsigned int)fd >= fdp->fd_nfiles)
if (fd < 0 || fd >= fdp->fd_nfiles)
return (NULL);
/*
* Fetch the descriptor locklessly. We avoid fdrop() races by
@ -2602,7 +2602,7 @@ dupfdopen(struct thread *td, struct filedesc *fdp, int dfd, int mode, int opener
* closed, then reject.
*/
FILEDESC_XLOCK(fdp);
if ((unsigned int)dfd >= fdp->fd_nfiles ||
if (dfd < 0 || dfd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[dfd]) == NULL) {
FILEDESC_XUNLOCK(fdp);
return (EBADF);

2
sys/kern/uipc_usrreq.c
View File

@ -1872,7 +1872,7 @@ unp_internalize(struct mbuf **controlp, struct thread *td)
FILEDESC_SLOCK(fdescp);
for (i = 0; i < oldfds; i++) {
fd = *fdp++;
if ((unsigned)fd >= fdescp->fd_nfiles ||
if (fd < 0 || fd >= fdescp->fd_nfiles ||
fdescp->fd_ofiles[fd] == NULL) {
FILEDESC_SUNLOCK(fdescp);
error = EBADF;

2
sys/netsmb/smb_dev.c
View File

@ -375,7 +375,7 @@ nsmb_getfp(struct filedesc* fdp, int fd, int flag)
struct file* fp;
FILEDESC_SLOCK(fdp);
if (((u_int)fd) >= fdp->fd_nfiles ||
if (fd < 0 || fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL ||
(fp->f_flag & flag) == 0) {
FILEDESC_SUNLOCK(fdp);