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-rw-r--r--fs/select.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/fs/select.c b/fs/select.c
index b80e7eb0ac0..f10a10317d5 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -22,6 +22,7 @@
#include <linux/personality.h> /* for STICKY_TIMEOUTS */
#include <linux/file.h>
#include <linux/fs.h>
+#include <linux/rcupdate.h>
#include <asm/uaccess.h>
@@ -132,11 +133,13 @@ static int max_select_fd(unsigned long n, fd_set_bits *fds)
unsigned long *open_fds;
unsigned long set;
int max;
+ struct fdtable *fdt;
/* handle last in-complete long-word first */
set = ~(~0UL << (n & (__NFDBITS-1)));
n /= __NFDBITS;
- open_fds = current->files->open_fds->fds_bits+n;
+ fdt = files_fdtable(current->files);
+ open_fds = fdt->open_fds->fds_bits+n;
max = 0;
if (set) {
set &= BITS(fds, n);
@@ -183,9 +186,9 @@ int do_select(int n, fd_set_bits *fds, long *timeout)
int retval, i;
long __timeout = *timeout;
- spin_lock(&current->files->file_lock);
+ rcu_read_lock();
retval = max_select_fd(n, fds);
- spin_unlock(&current->files->file_lock);
+ rcu_read_unlock();
if (retval < 0)
return retval;
@@ -299,6 +302,7 @@ sys_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, s
char *bits;
long timeout;
int ret, size, max_fdset;
+ struct fdtable *fdt;
timeout = MAX_SCHEDULE_TIMEOUT;
if (tvp) {
@@ -326,7 +330,10 @@ sys_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, s
goto out_nofds;
/* max_fdset can increase, so grab it once to avoid race */
- max_fdset = current->files->max_fdset;
+ rcu_read_lock();
+ fdt = files_fdtable(current->files);
+ max_fdset = fdt->max_fdset;
+ rcu_read_unlock();
if (n > max_fdset)
n = max_fdset;
@@ -464,9 +471,15 @@ asmlinkage long sys_poll(struct pollfd __user * ufds, unsigned int nfds, long ti
unsigned int i;
struct poll_list *head;
struct poll_list *walk;
+ struct fdtable *fdt;
+ int max_fdset;
/* Do a sanity check on nfds ... */
- if (nfds > current->files->max_fdset && nfds > OPEN_MAX)
+ rcu_read_lock();
+ fdt = files_fdtable(current->files);
+ max_fdset = fdt->max_fdset;
+ rcu_read_unlock();
+ if (nfds > max_fdset && nfds > OPEN_MAX)
return -EINVAL;
if (timeout) {