smb: client: fix potential NULL deref in parse_dfs_referrals()

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commit 92414333eb upstream.

If server returned no data for FSCTL_DFS_GET_REFERRALS, @dfs_rsp will
remain NULL and then parse_dfs_referrals() will dereference it.

Fix this by returning -EIO when no output data is returned.

Besides, we can't fix it in SMB2_ioctl() as some FSCTLs are allowed to
return no data as per MS-SMB2 2.2.32.

Fixes: 9d49640a21 ("CIFS: implement get_dfs_refer for SMB2+")
Cc: stable@vger.kernel.org
Reported-by: Robert Morris <rtm@csail.mit.edu>
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Paulo Alcantara 2023-12-05 21:49:29 -03:00 • committed by Greg Kroah-Hartman

parent f48430635b

commit b12ccef705

1 changed files with 2 additions and 0 deletions

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fs/smb/client/smb2ops.c

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