Commit 41771de5 authored by Dan Carpenter's avatar Dan Carpenter Committed by Greg Kroah-Hartman

drivers/virt/fsl_hypervisor.c: dereferencing error pointers in ioctl

commit c8ea3663 upstream.

strndup_user() returns error pointers on error, and then in the error
handling we pass the error pointers to kfree().  It will cause an Oops.

Link: http://lkml.kernel.org/r/20181218082003.GD32567@kadam
Fixes: 6db71994 ("drivers/virt: introduce Freescale hypervisor management driver")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Timur Tabi <timur@freescale.com>
Cc: Mihai Caraman <mihai.caraman@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent de2dec85
......@@ -331,8 +331,8 @@ static long ioctl_dtprop(struct fsl_hv_ioctl_prop __user *p, int set)
struct fsl_hv_ioctl_prop param;
char __user *upath, *upropname;
void __user *upropval;
char *path = NULL, *propname = NULL;
void *propval = NULL;
char *path, *propname;
void *propval;
int ret = 0;
/* Get the parameters from the user. */
......@@ -344,32 +344,30 @@ static long ioctl_dtprop(struct fsl_hv_ioctl_prop __user *p, int set)
upropval = (void __user *)(uintptr_t)param.propval;
path = strndup_user(upath, FH_DTPROP_MAX_PATHLEN);
if (IS_ERR(path)) {
ret = PTR_ERR(path);
goto out;
}
if (IS_ERR(path))
return PTR_ERR(path);
propname = strndup_user(upropname, FH_DTPROP_MAX_PATHLEN);
if (IS_ERR(propname)) {
ret = PTR_ERR(propname);
goto out;
goto err_free_path;
}
if (param.proplen > FH_DTPROP_MAX_PROPLEN) {
ret = -EINVAL;
goto out;
goto err_free_propname;
}
propval = kmalloc(param.proplen, GFP_KERNEL);
if (!propval) {
ret = -ENOMEM;
goto out;
goto err_free_propname;
}
if (set) {
if (copy_from_user(propval, upropval, param.proplen)) {
ret = -EFAULT;
goto out;
goto err_free_propval;
}
param.ret = fh_partition_set_dtprop(param.handle,
......@@ -388,7 +386,7 @@ static long ioctl_dtprop(struct fsl_hv_ioctl_prop __user *p, int set)
if (copy_to_user(upropval, propval, param.proplen) ||
put_user(param.proplen, &p->proplen)) {
ret = -EFAULT;
goto out;
goto err_free_propval;
}
}
}
......@@ -396,10 +394,12 @@ static long ioctl_dtprop(struct fsl_hv_ioctl_prop __user *p, int set)
if (put_user(param.ret, &p->ret))
ret = -EFAULT;
out:
kfree(path);
err_free_propval:
kfree(propval);
err_free_propname:
kfree(propname);
err_free_path:
kfree(path);
return ret;
}
......
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