linux-kernel - [PATCH] file descriptor leak in sys

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Date:	Mon, 5 May 2008 05:21:57 -0400
From:	Ulrich Drepper <drepper@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, dm.n9107@...il.com,
	torvalds@...ux-foundation.org
Subject: [PATCH] file descriptor leak in sys_pipe

DM <dm.n9107@...il.com> wrote:
> I realize this code is old, but wouldn't file descriptors leak if
> copy_to_user fails?

I think you're right.  The following should patch it for the remaining
C implementations which need that kind of patch.


Signed-off-by: Ulrich Drepper <drepper@...hat.com>

diff --git a/arch/cris/kernel/sys_cris.c b/arch/cris/kernel/sys_cris.c
index 8b99841..d124066 100644
--- a/arch/cris/kernel/sys_cris.c
+++ b/arch/cris/kernel/sys_cris.c
@@ -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;
 }
diff --git a/arch/m32r/kernel/sys_m32r.c b/arch/m32r/kernel/sys_m32r.c
index 6d7a80f..319c797 100644
--- a/arch/m32r/kernel/sys_m32r.c
+++ b/arch/m32r/kernel/sys_m32r.c
@@ -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;
 }
diff --git a/fs/pipe.c b/fs/pipe.c
index 3499f9f..ec228bc 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -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;
 }
--
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