dm ioctl: fix out of bounds array access when no devices

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commit 4edbe1d7bc upstream.

If there are not any dm devices, we need to zero the "dev" argument in
the first structure dm_name_list. However, this can cause out of
bounds write, because the "needed" variable is zero and len may be
less than eight.

Fix this bug by reporting DM_BUFFER_FULL_FLAG if the result buffer is
too small to hold the "nl->dev" value.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Mikulas Patocka 2021-03-26 14:32:32 -04:00 • committed by Greg Kroah-Hartman

parent d8b36c483d

commit 921aae17bb

1 changed files with 1 additions and 1 deletions

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drivers/md/dm-ioctl.c

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