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fuse: do not allow mapping a non-regular backing file

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We do not support passthrough operations other than read/write on
regular file, so allowing non-regular backing files makes no sense.

Fixes: efad7153bf ("fuse: allow O_PATH fd for FUSE_DEV_IOC_BACKING_OPEN")
Cc: stable@vger.kernel.org
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Bernd Schubert <bschubert@ddn.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2025-07-10 12:08:30 +02:00 committed by Miklos Szeredi
parent 1b237f190e
commit e9c8da670e
1 changed files with 5 additions and 0 deletions
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5
fs/fuse/passthrough.c
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@ -237,6 +237,11 @@ int fuse_backing_open(struct fuse_conn *fc, struct fuse_backing_map *map)
if (!file)
goto out;
/* read/write/splice/mmap passthrough only relevant for regular files */
res = d_is_dir(file->f_path.dentry) ? -EISDIR : -EINVAL;
if (!d_is_reg(file->f_path.dentry))
goto out_fput;
backing_sb = file_inode(file)->i_sb;
res = -ELOOP;
if (backing_sb->s_stack_depth >= fc->max_stack_depth)