Messages in this thread | | | Date | Sun, 04 Oct 2020 14:48:23 -0700 (PDT) | Subject | Re: [PATCH] net: team: fix memory leak in __team_options_register | From | David Miller <> |
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From: Anant Thazhemadam <anant.thazhemadam@gmail.com> Date: Mon, 5 Oct 2020 02:25:36 +0530
> The variable "i" isn't initialized back correctly after the first loop > under the label inst_rollback gets executed. > > The value of "i" is assigned to be option_count - 1, and the ensuing > loop (under alloc_rollback) begins by initializing i--. > Thus, the value of i when the loop begins execution will now become > i = option_count - 2. > > Thus, when kfree(dst_opts[i]) is called in the second loop in this > order, (i.e., inst_rollback followed by alloc_rollback), > dst_optsp[option_count - 2] is the first element freed, and > dst_opts[option_count - 1] does not get freed, and thus, a memory > leak is caused. > > This memory leak can be fixed, by assigning i = option_count (instead of > option_count - 1). > > Fixes: 80f7c6683fe0 ("team: add support for per-port options") > Reported-by: syzbot+69b804437cfec30deac3@syzkaller.appspotmail.com > Tested-by: syzbot+69b804437cfec30deac3@syzkaller.appspotmail.com > Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Applied and queued up for -stable, thank you.
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