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cifs: Fix parsing reparse point with native symlink in SMB1 non-UNICODE session

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BugLink: https://bugs.launchpad.net/bugs/2101915

[ Upstream commit f4ca4f5a36eac9b4da378a0f28cbbe38534a0901 ]

SMB1 NT_TRANSACT_IOCTL/FSCTL_GET_REPARSE_POINT even in non-UNICODE mode
returns reparse buffer in UNICODE/UTF-16 format.

This is because FSCTL_GET_REPARSE_POINT is NT-based IOCTL which does not
distinguish between 8-bit non-UNICODE and 16-bit UNICODE modes and its path
buffers are always encoded in UTF-16.

This change fixes reading of native symlinks in SMB1 when UNICODE session
is not active.

Fixes: ed3e0a149b ("smb: client: implement ->query_reparse_point() for SMB1")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Pali Rohár
2025-03-11 08:51:19 +09:00
committed by Stefan Bader
parent e8dd8a287f
commit 168653c813
1 changed files with 1 additions and 2 deletions
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fs/smb/client/smb1ops.c
+1 -2
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@@ -1000,12 +1000,11 @@ static int cifs_parse_reparse_point(struct cifs_sb_info *cifs_sb,
{
struct reparse_data_buffer *buf;
TRANSACT_IOCTL_RSP *io = rsp_iov->iov_base;
bool unicode = !!(io->hdr.Flags2 & SMBFLG2_UNICODE);
u32 plen = le16_to_cpu(io->ByteCount);
buf = (struct reparse_data_buffer *)((__u8 *)&io->hdr.Protocol +
le32_to_cpu(io->DataOffset));
return parse_reparse_point(buf, plen, cifs_sb, full_path, unicode, data);
return parse_reparse_point(buf, plen, cifs_sb, full_path, true, data);
}
static bool