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authorOleg Nesterov <oleg@redhat.com>2017-10-03 16:15:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-10-03 17:54:25 -0700
commit43a4f2619038002f48c78698c42c05692d4b4eb2 (patch)
treeca46e0bb1cbd6a522131f473ce7d7a4d9fe64a43 /fs/ncpfs
parenteb23aa0317eb1f08e8d9d36b8753d42f03b32764 (diff)
exec: binfmt_misc: fix race between load_misc_binary() and kill_node()
load_misc_binary() makes a local copy of fmt->interpreter under entries_lock to avoid the race with kill_node() but this is not enough; the whole Node can be freed after we drop entries_lock, not only the ->interpreter string. Add dget/dput(fmt->dentry) to ensure bm_evict_inode() can't destroy/free this Node. Link: http://lkml.kernel.org/r/20170922143650.GA17227@redhat.com Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Ben Woodard <woodard@redhat.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Jim Foraker <foraker1@llnl.gov> Cc: Travis Gummels <tgummels@redhat.com> Cc: <tdhooge@llnl.gov> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ncpfs')
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