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fs: add missing compat_ptr handling for FS_IOC_RESVSP ioctl 

For FS_IOC_RESVSP and FS_IOC_RESVSP64 compat_sys_ioctl() uses its
arg argument as a pointer to userspace. However it is missing a
a call to compat_ptr() which will do a proper pointer conversion.

This was introduced with 3e63cbb1 "fs: Add new pre-allocation ioctls
to vfs for compatibility with legacy xfs ioctls".

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Ankit Jain <me@ankitjain.org>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Arnd Bergmann <arndbergmann@googlemail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: <stable@kernel.org>		[2.6.31.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Heiko Carstens 2009-11-11 14:26:34 -08:00 committed by Linus Torvalds
parent 29f12ca321
commit 7779d7bed9
1 changed files with 2 additions and 2 deletions
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4
fs/compat_ioctl.c
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@ -1800,7 +1800,7 @@ struct space_resv_32 {
/* just account for different alignment */ /* just account for different alignment */
static int compat_ioctl_preallocate(struct file *file, unsigned long arg) static int compat_ioctl_preallocate(struct file *file, unsigned long arg)
{ {
struct space_resv_32 __user *p32 = (void __user *)arg; struct space_resv_32 __user *p32 = compat_ptr(arg);
struct space_resv __user *p = compat_alloc_user_space(sizeof(*p)); struct space_resv __user *p = compat_alloc_user_space(sizeof(*p));
if (copy_in_user(&p->l_type, &p32->l_type, sizeof(s16)) || if (copy_in_user(&p->l_type, &p32->l_type, sizeof(s16)) ||
@ -2802,7 +2802,7 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
#else #else
case FS_IOC_RESVSP: case FS_IOC_RESVSP:
case FS_IOC_RESVSP64: case FS_IOC_RESVSP64:
error = ioctl_preallocate(filp, (void __user *)arg); error = ioctl_preallocate(filp, compat_ptr(arg));
goto out_fput; goto out_fput;
#endif #endif