From: Anant Thazhemadam anant.thazhemadam@gmail.com
commit 9a9e77495958c7382b2438bc19746dd3aaaabb8e upstream.
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 Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/team/team.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/team/team.c +++ b/drivers/net/team/team.c @@ -294,7 +294,7 @@ inst_rollback: for (i--; i >= 0; i--) __team_option_inst_del_option(team, dst_opts[i]);
- i = option_count - 1; + i = option_count; alloc_rollback: for (i--; i >= 0; i--) kfree(dst_opts[i]);