ftrace: Check if pages were allocated before calling free_pages()

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It is possible that on error pg->size can be zero when getting its order,
which would return a -1 value. It is dangerous to pass in an order of -1
to free_pages(). Check if order is greater than or equal to zero before
calling free_pages().

Link: https://lore.kernel.org/lkml/20210330093916.432697c7@gandalf.local.home/

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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Steven Rostedt (VMware) 2021-03-30 09:58:38 -04:00

parent 83b62687a0

commit 59300b36f8

1 changed files with 6 additions and 3 deletions

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kernel/trace/ftrace.c

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