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sys_pipe(): fix file descriptor leaks 

Remember to close the files if copy_to_user() failed.

Spotted by dm.n9107@gmail.com.

Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Cc: DM <dm.n9107@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ulrich Drepper 2008-05-06 20:42:38 -07:00 committed by Linus Torvalds
parent c1236d31a1
commit ba719baeab
3 changed files with 13 additions and 3 deletions
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5
arch/cris/kernel/sys_cris.c
View File

@ -40,8 +40,11 @@ asmlinkage int sys_pipe(unsigned long __user * fildes)
error = do_pipe(fd);
unlock_kernel();
if (!error) {
if (copy_to_user(fildes, fd, 2*sizeof(int)))
if (copy_to_user(fildes, fd, 2*sizeof(int))) {
sys_close(fd[0]);
sys_close(fd[1]);
error = -EFAULT;
}
}
return error;
}

5
arch/m32r/kernel/sys_m32r.c
View File

@ -90,8 +90,11 @@ sys_pipe(unsigned long r0, unsigned long r1, unsigned long r2,
error = do_pipe(fd);
if (!error) {
if (copy_to_user((void __user *)r0, fd, 2*sizeof(int)))
if (copy_to_user((void __user *)r0, fd, 2*sizeof(int))) {
sys_close(fd[0]);
sys_close(fd[1]);
error = -EFAULT;
}
}
return error;
}

6
fs/pipe.c
View File

@ -17,6 +17,7 @@
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/audit.h>
#include <linux/syscalls.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
@ -1086,8 +1087,11 @@ asmlinkage long __weak sys_pipe(int __user *fildes)
error = do_pipe(fd);
if (!error) {
if (copy_to_user(fildes, fd, sizeof(fd)))
if (copy_to_user(fildes, fd, sizeof(fd))) {
sys_close(fd[0]);
sys_close(fd[1]);
error = -EFAULT;
}
}
return error;
}