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reverse_path_check_proc(): don't bother with cookies

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We know there's no loops by the time we call it; the
only thing we care about is too deep reverse paths.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-09-25 19:48:56 -04:00
parent aebf15f0fb
commit 0c320f776e
1 changed files with 1 additions and 2 deletions
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3
fs/eventpoll.c
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@ -1311,7 +1311,7 @@ static int reverse_path_check_proc(struct file *file, int depth)
int error = 0; int error = 0;
struct epitem *epi; struct epitem *epi;
if (!ep_push_nested(file)) /* limits recursion */ if (depth > EP_MAX_NESTS) /* too deep nesting */
return -1; return -1;
/* CTL_DEL can remove links here, but that can't increase our count */ /* CTL_DEL can remove links here, but that can't increase our count */
@ -1336,7 +1336,6 @@ static int reverse_path_check_proc(struct file *file, int depth)
} }
} }
rcu_read_unlock(); rcu_read_unlock();
nesting--; /* pop */
return error; return error;
} }