cifs: do not depend on release_iface for maintaining iface_list

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commit 09eeb0723f upstream.

parse_server_interfaces should be in complete charge of maintaining
the iface_list linked list. Today, iface entries are removed
from the list only when the last refcount is dropped.
i.e. in release_iface. However, this can result in undercounting
of refcount if the server stops advertising interfaces (which
Azure SMB server does).

This change puts parse_server_interfaces in full charge of
maintaining the iface_list. So if an empty list is returned
by the server, the entries in the list will immediately be
removed. This way, a following call to the same function will
not find entries in the list.

Fixes: aa45dadd34 ("cifs: change iface_list from array to sorted linked list")
Cc: stable@vger.kernel.org
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Shyam Prasad N 2023-12-29 11:16:16 +00:00 • committed by Greg Kroah-Hartman

parent 40fc7dfd17

commit 30aae98b75

2 changed files with 17 additions and 11 deletions

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1

fs/smb/client/cifsglob.h

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27

fs/smb/client/smb2ops.c

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