Added a check to the compression_unit so that out of bound doesn't
occur.

Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com>
Reported-by: syzbot+4768a8f039aa677897d0@syzkaller.appspotmail.com
---
 fs/ntfs/inode.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 6c3f38d66579..2ee100a7df32 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -1077,6 +1077,17 @@ static int ntfs_read_locked_inode(struct inode *vi)
 					goto unm_err_out;
 				}
 				if (a->data.non_resident.compression_unit) {
+					if(a->data.non_resident.compression_unit + 
+						vol->cluster_size_bits > 32) {
+							ntfs_error(vi->i_sb, "Found "
+								"non-standard "
+								"compression unit (%u).   "
+								"Cannot handle this.",
+								a->data.non_resident.
+								compression_unit);
+							err = -EOPNOTSUPP;
+							goto unm_err_out;
+						}
 					ni->itype.compressed.block_size = 1U <<
 							(a->data.non_resident.
 							compression_unit +
-- 
2.37.2

On Tue, Aug 08, 2023 at 10:04:05AM +0530, Manas Ghandat wrote:
> Added a check to the compression_unit so that out of bound doesn't
> occur.
> 
> Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com>
> Reported-by: syzbot+4768a8f039aa677897d0@syzkaller.appspotmail.com
> ---
>  fs/ntfs/inode.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
> index 6c3f38d66579..2ee100a7df32 100644
> --- a/fs/ntfs/inode.c
> +++ b/fs/ntfs/inode.c
> @@ -1077,6 +1077,17 @@ static int ntfs_read_locked_inode(struct inode *vi)
>  					goto unm_err_out;
>  				}
>  				if (a->data.non_resident.compression_unit) {
> +					if(a->data.non_resident.compression_unit + 
> +						vol->cluster_size_bits > 32) {
> +							ntfs_error(vi->i_sb, "Found "
> +								"non-standard "
> +								"compression unit (%u).   "
> +								"Cannot handle this.",

Please do not split strings across lines.

And checkpatch will find other problems with this change as well, did
you run it before submitting it.

thanks,

greg k-h

Added a check to the compression_unit so that out of bound doesn't occur.

Fix patching issues in version 2.

Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com>
Reported-by: syzbot+4768a8f039aa677897d0@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=4768a8f039aa677897d0
---
 fs/ntfs/inode.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 6c3f38d66579..a657322874ed 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -1077,6 +1077,15 @@ static int ntfs_read_locked_inode(struct inode *vi)
 					goto unm_err_out;
 				}
 				if (a->data.non_resident.compression_unit) {
+					if (a->data.non_resident.compression_unit +
+						vol->cluster_size_bits > 32) {
+						ntfs_error(vi->i_sb,
+							"Found non-standard compression unit (%u).   Cannot handle this.",
+							a->data.non_resident.compression_unit
+						);
+						err = -EOPNOTSUPP;
+						goto unm_err_out;
+					}
 					ni->itype.compressed.block_size = 1U <<
 							(a->data.non_resident.
 							compression_unit +
-- 
2.37.2

On Tue, Aug 08, 2023 at 03:59:58PM +0530, Manas Ghandat wrote:
> Added a check to the compression_unit so that out of bound doesn't occur.
> 
> Fix patching issues in version 2.
> 
> Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com>
> Reported-by: syzbot+4768a8f039aa677897d0@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=4768a8f039aa677897d0
> ---
>  fs/ntfs/inode.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
> index 6c3f38d66579..a657322874ed 100644
> --- a/fs/ntfs/inode.c
> +++ b/fs/ntfs/inode.c
> @@ -1077,6 +1077,15 @@ static int ntfs_read_locked_inode(struct inode *vi)
>  					goto unm_err_out;
>  				}
>  				if (a->data.non_resident.compression_unit) {
> +					if (a->data.non_resident.compression_unit +
> +						vol->cluster_size_bits > 32) {
> +						ntfs_error(vi->i_sb,
> +							"Found non-standard compression unit (%u).   Cannot handle this.",
> +							a->data.non_resident.compression_unit
> +						);
> +						err = -EOPNOTSUPP;
> +						goto unm_err_out;
> +					}
>  					ni->itype.compressed.block_size = 1U <<
>  							(a->data.non_resident.
>  							compression_unit +
> -- 
> 2.37.2
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
as indicated below:

- This looks like a new version of a previously submitted patch, but you
  did not list below the --- line any changes from the previous version.
  Please read the section entitled "The canonical patch format" in the
  kernel file, Documentation/process/submitting-patches.rst for what
  needs to be done here to properly describe this.


If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.

thanks,

greg k-h's patch email bot