4.19-stable patches

added patches:
	btrfs-allocate-btrfs_ioctl_defrag_range_args-on-stack.patch

diff --git a/queue-4.19/btrfs-allocate-btrfs_ioctl_defrag_range_args-on-stack.patch b/queue-4.19/btrfs-allocate-btrfs_ioctl_defrag_range_args-on-stack.patch
new file mode 100644 (file)
index 0000000..566ef93
--- /dev/null
+++ b/queue-4.19/btrfs-allocate-btrfs_ioctl_defrag_range_args-on-stack.patch
@@ -0,0 +1,88 @@
+From c853a5783ebe123847886d432354931874367292 Mon Sep 17 00:00:00 2001
+From: Goldwyn Rodrigues <rgoldwyn@suse.com>
+Date: Tue, 27 Jul 2021 16:17:30 -0500
+Subject: btrfs: allocate btrfs_ioctl_defrag_range_args on stack
+
+From: Goldwyn Rodrigues <rgoldwyn@suse.com>
+
+commit c853a5783ebe123847886d432354931874367292 upstream.
+
+Instead of using kmalloc() to allocate btrfs_ioctl_defrag_range_args,
+allocate btrfs_ioctl_defrag_range_args on stack, the size is reasonably
+small and ioctls are called in process context.
+
+sizeof(btrfs_ioctl_defrag_range_args) = 48
+
+Reviewed-by: Anand Jain <anand.jain@oracle.com>
+Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
+Reviewed-by: David Sterba <dsterba@suse.com>
+Signed-off-by: David Sterba <dsterba@suse.com>
+[ This patch is needed to fix a memory leak of "range" that was
+introduced when commit 173431b274a9 ("btrfs: defrag: reject unknown
+flags of btrfs_ioctl_defrag_range_args") was backported to kernels
+lacking this patch. Now with these two patches applied in reverse order,
+range->flags needed to change back to range.flags.
+This bug was discovered and resolved using Coverity Static Analysis
+Security Testing (SAST) by Synopsys, Inc.]
+Signed-off-by: Maximilian Heyne <mheyne@amazon.de>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/btrfs/ioctl.c |   25 ++++++++-----------------
+ 1 file changed, 8 insertions(+), 17 deletions(-)
+
+--- a/fs/btrfs/ioctl.c
++++ b/fs/btrfs/ioctl.c
+@@ -2992,7 +2992,7 @@ static int btrfs_ioctl_defrag(struct fil
+ {
+       struct inode *inode = file_inode(file);
+       struct btrfs_root *root = BTRFS_I(inode)->root;
+-      struct btrfs_ioctl_defrag_range_args *range;
++      struct btrfs_ioctl_defrag_range_args range = {0};
+       int ret;
+ 
+       ret = mnt_want_write_file(file);
+@@ -3024,37 +3024,28 @@ static int btrfs_ioctl_defrag(struct fil
+                       goto out;
+               }
+ 
+-              range = kzalloc(sizeof(*range), GFP_KERNEL);
+-              if (!range) {
+-                      ret = -ENOMEM;
+-                      goto out;
+-              }
+-
+               if (argp) {
+-                      if (copy_from_user(range, argp,
+-                                         sizeof(*range))) {
++                      if (copy_from_user(&range, argp, sizeof(range))) {
+                               ret = -EFAULT;
+-                              kfree(range);
+                               goto out;
+                       }
+-                      if (range->flags & ~BTRFS_DEFRAG_RANGE_FLAGS_SUPP) {
++                      if (range.flags & ~BTRFS_DEFRAG_RANGE_FLAGS_SUPP) {
+                               ret = -EOPNOTSUPP;
+                               goto out;
+                       }
+                       /* compression requires us to start the IO */
+-                      if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
+-                              range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
+-                              range->extent_thresh = (u32)-1;
++                      if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
++                              range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
++                              range.extent_thresh = (u32)-1;
+                       }
+               } else {
+                       /* the rest are all set to zero by kzalloc */
+-                      range->len = (u64)-1;
++                      range.len = (u64)-1;
+               }
+               ret = btrfs_defrag_file(file_inode(file), file,
+-                                      range, BTRFS_OLDEST_GENERATION, 0);
++                                      &range, BTRFS_OLDEST_GENERATION, 0);
+               if (ret > 0)
+                       ret = 0;
+-              kfree(range);
+               break;
+       default:
+               ret = -EINVAL;

diff --git a/queue-4.19/series b/queue-4.19/series
index dd25641bed7a7f0b9a7024355eac043fd6d1295c..7d06cce918a011b35b541ac772398ad9e1b05adb 100644 (file)
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -78,3 +78,4 @@ tty-serial-fsl_lpuart-avoid-idle-preamble-pending-if-cts-is-enabled.patch
 vt-fix-unicode-buffer-corruption-when-deleting-characters.patch
 fs-aio-check-iocb_aio_rw-before-the-struct-aio_kiocb-conversion.patch
 printk-update-console_may_schedule-in-console_tryloc.patch
+btrfs-allocate-btrfs_ioctl_defrag_range_args-on-stack.patch