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process_vm_access: switch to {compat_,}import_iovec()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-03-21 14:47:11 -04:00
parent b353a1f7bb
commit 17d17e7282
1 changed files with 12 additions and 23 deletions
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35
mm/process_vm_access.c
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@ -257,22 +257,18 @@ static ssize_t process_vm_rw(pid_t pid,
struct iovec *iov_r = iovstack_r; struct iovec *iov_r = iovstack_r;
struct iov_iter iter; struct iov_iter iter;
ssize_t rc; ssize_t rc;
int dir = vm_write ? WRITE : READ;
if (flags != 0) if (flags != 0)
return -EINVAL; return -EINVAL;
/* Check iovecs */ /* Check iovecs */
if (vm_write) rc = import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter);
rc = rw_copy_check_uvector(WRITE, lvec, liovcnt, UIO_FASTIOV, if (rc < 0)
iovstack_l, &iov_l); return rc;
else if (!iov_iter_count(&iter))
rc = rw_copy_check_uvector(READ, lvec, liovcnt, UIO_FASTIOV,
iovstack_l, &iov_l);
if (rc <= 0)
goto free_iovecs; goto free_iovecs;
iov_iter_init(&iter, vm_write ? WRITE : READ, iov_l, liovcnt, rc);
rc = rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV, rc = rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV,
iovstack_r, &iov_r); iovstack_r, &iov_r);
if (rc <= 0) if (rc <= 0)
@ -283,8 +279,7 @@ static ssize_t process_vm_rw(pid_t pid,
free_iovecs: free_iovecs:
if (iov_r != iovstack_r) if (iov_r != iovstack_r)
kfree(iov_r); kfree(iov_r);
if (iov_l != iovstack_l) kfree(iov_l);
kfree(iov_l);
return rc; return rc;
} }
@ -320,21 +315,16 @@ compat_process_vm_rw(compat_pid_t pid,
struct iovec *iov_r = iovstack_r; struct iovec *iov_r = iovstack_r;
struct iov_iter iter; struct iov_iter iter;
ssize_t rc = -EFAULT; ssize_t rc = -EFAULT;
int dir = vm_write ? WRITE : READ;
if (flags != 0) if (flags != 0)
return -EINVAL; return -EINVAL;
if (vm_write) rc = compat_import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter);
rc = compat_rw_copy_check_uvector(WRITE, lvec, liovcnt, if (rc < 0)
UIO_FASTIOV, iovstack_l, return rc;
&iov_l); if (!iov_iter_count(&iter))
else
rc = compat_rw_copy_check_uvector(READ, lvec, liovcnt,
UIO_FASTIOV, iovstack_l,
&iov_l);
if (rc <= 0)
goto free_iovecs; goto free_iovecs;
iov_iter_init(&iter, vm_write ? WRITE : READ, iov_l, liovcnt, rc);
rc = compat_rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, rc = compat_rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt,
UIO_FASTIOV, iovstack_r, UIO_FASTIOV, iovstack_r,
&iov_r); &iov_r);
@ -346,8 +336,7 @@ compat_process_vm_rw(compat_pid_t pid,
free_iovecs: free_iovecs:
if (iov_r != iovstack_r) if (iov_r != iovstack_r)
kfree(iov_r); kfree(iov_r);
if (iov_l != iovstack_l) kfree(iov_l);
kfree(iov_l);
return rc; return rc;
} }