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| author | Paulo Alcantara <pc@manguebit.org> | 2026-09-06 16:01:16 -0300 |
|---|---|---|
| committer | Paulo Alcantara <pc@manguebit.org> | 2026-09-08 11:30:18 -0300 |
| commit | 65d5dbdc089be42fc48a6f77bc6b648307f34b17 (patch) | |
| tree | c13fa50f59b5690e014e3b938008617551f72f0a | |
| parent | fa7a2cfcf1e6117fc478cae6809c66c518740969 (diff) | |
| download | linux-next-65d5dbdc089be42fc48a6f77bc6b648307f34b17.tar.gz linux-next-65d5dbdc089be42fc48a6f77bc6b648307f34b17.zip | |
smb: client: fix file type corruption in posix_reparse_to_fattr()
Setting the file type in cf_mode without clearing the existing S_IFMT
bits first is wrong as it corrupts the file type when cf_mode already
has type bits set (e.g. S_IFREG | S_IFCHR == S_IFLNK).
Use a local ftype variable to collect the new file type and apply it
after validation succeeds, clearing S_IFMT and setting the new type in
a single assignment. This avoids stripping cf_mode on malformed
reparse points where the function returns false early.
Closes: https://sashiko.dev/#/patchset/20260906172005.627163-1-pc%40manguebit.org
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Shyam Prasad N <sprasad@microsoft.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Bharath SM <bharathsm@microsoft.com>
Cc: stable@vger.kernel.org
| -rw-r--r-- | fs/smb/client/reparse.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c index 8a19dee564b8..616ca2dbfac4 100644 --- a/fs/smb/client/reparse.c +++ b/fs/smb/client/reparse.c @@ -1212,6 +1212,7 @@ static bool posix_reparse_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_open_info_data *data) { struct reparse_nfs_data_buffer *buf = (struct reparse_nfs_data_buffer *)data->reparse.buf; + umode_t ftype; if (buf == NULL) return true; @@ -1227,7 +1228,7 @@ static bool posix_reparse_to_fattr(struct cifs_sb_info *cifs_sb, WARN_ON_ONCE(1); return false; } - fattr->cf_mode |= S_IFCHR; + ftype = S_IFCHR; fattr->cf_rdev = reparse_mkdev(buf->DataBuffer); break; case NFS_SPECFILE_BLK: @@ -1235,22 +1236,23 @@ static bool posix_reparse_to_fattr(struct cifs_sb_info *cifs_sb, WARN_ON_ONCE(1); return false; } - fattr->cf_mode |= S_IFBLK; + ftype = S_IFBLK; fattr->cf_rdev = reparse_mkdev(buf->DataBuffer); break; case NFS_SPECFILE_FIFO: - fattr->cf_mode |= S_IFIFO; + ftype = S_IFIFO; break; case NFS_SPECFILE_SOCK: - fattr->cf_mode |= S_IFSOCK; + ftype = S_IFSOCK; break; case NFS_SPECFILE_LNK: - fattr->cf_mode |= S_IFLNK; + ftype = S_IFLNK; break; default: WARN_ON_ONCE(1); return false; } + fattr->cf_mode = (fattr->cf_mode & ~S_IFMT) | ftype; return true; } |