net: genl: fix error path memory leak in policy dumping

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If construction of the array of policies fails when recording
non-first policy we need to unwind.

netlink_policy_dump_add_policy() itself also needs fixing as
it currently gives up on error without recording the allocated
pointer in the pstate pointer.

Reported-by: syzbot+dc54d9ba8153b216cae0@syzkaller.appspotmail.com
Fixes: 50a896cf2d ("genetlink: properly support per-op policy dumping")
Link: https://lore.kernel.org/r/20220816161939.577583-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Jakub Kicinski 2022-08-16 09:19:39 -07:00

parent 5c23d6b717

commit 249801360d

2 changed files with 17 additions and 3 deletions

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6

net/netlink/genetlink.c

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14

net/netlink/policy.c

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