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bug#23983: [PATCH] grep: fix crash with a pattern of alternation of two
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From: |
Eric Blake |
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Subject: |
bug#23983: [PATCH] grep: fix crash with a pattern of alternation of two same characters |
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Date: |
Thu, 14 Jul 2016 11:28:56 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 07/14/2016 09:07 AM, Norihiro Tanaka wrote:
> Current master crashes with below.
>
> $ printf '0\n0' >pat
> $ printf '0\n' >in
> $ env LC_ALL=C grep -F pat in
>
> grep -F uses memchr2() for each character in this pattern, but if two
> characters is same, the trie has no child.
memchr2() should already be handling the special case of the same
character requested twice, without clients having to code around it.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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