[PATCH] select: don't overflow if (SELECT_STACK_ALLOC % sizeof(long) != 0)

b04eb6aa · Mitchell Blank Jr <[email protected]> · 2006-04-10 22:54:08 -07:00

If SELECT_STACK_ALLOC is not a multiple of sizeof(long) then stack_fds[]
would be shorter than SELECT_STACK_ALLOC bytes and could overflow later in
the function.  Fixed by simply rearranging the test later to work on
sizeof(stack_fds) Currently SELECT_STACK_ALLOC is 256 so this doesn't
happen, but it's nasty to have things like this hidden in the code.  What
if later someone decides to change SELECT_STACK_ALLOC to 300?

Signed-off-by: Mitchell Blank Jr <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: b04eb6aa08ecc3e24df2f78ebc486011ebd74feb
Parents: a9cdf410

Changes

1 files changed · +9 −7

File	Status	Add	Del	Content
fs/select.c	modified	+9	−7	View file

fs/select.c

View file

diff --git a/fs/select.c b/fs/select.c
index fce0fd1..a8109ba 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -311,7 +311,8 @@ static int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
 {
 	fd_set_bits fds;
 	void *bits;
-	int ret, size, max_fdset;
+	int ret, max_fdset;
+	unsigned int size;
 	struct fdtable *fdt;
 	/* Allocate small arguments on the stack to save memory and be faster */
 	long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
@@ -333,14 +334,15 @@ static int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
 	 * since we used fdset we need to allocate memory in units of
 	 * long-words. 
 	 */
-	ret = -ENOMEM;
 	size = FDS_BYTES(n);
-	if (6*size < SELECT_STACK_ALLOC)
-		bits = stack_fds;
-	else
+	bits = stack_fds;
+	if (size > sizeof(stack_fds) / 6) {
+		/* Not enough space in on-stack array; must use kmalloc */
+		ret = -ENOMEM;
 		bits = kmalloc(6 * size, GFP_KERNEL);
-	if (!bits)
-		goto out_nofds;
+		if (!bits)
+			goto out_nofds;
+	}
 	fds.in      = bits;
 	fds.out     = bits +   size;
 	fds.ex      = bits + 2*size;