From: Jonathan Nieder <jrnieder@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Jeff King" <peff@peff.net>,
"Thomas Gummerer" <t.gummerer@gmail.com>,
git@vger.kernel.org, "Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>
Subject: Re: [PATCH 1/3] path.c: fix uninitialized memory access
Date: Wed, 4 Oct 2017 12:36:17 -0700 [thread overview]
Message-ID: <20171004193617.GR19555@aiede.mtv.corp.google.com> (raw)
In-Reply-To: <xmqqfuazecym.fsf@gitster.mtv.corp.google.com>
Junio C Hamano wrote:
> From: Jeff King <peff@peff.net>
> Date: Tue, 3 Oct 2017 19:30:40 -0400
> Subject: [PATCH] path.c: fix uninitialized memory access
>
> In cleanup_path we're passing in a char array, run a memcmp on it, and
> run through it without ever checking if something is in the array in the
> first place. This can lead us to access uninitialized memory, for
> example in t5541-http-push-smart.sh test 7, when run under valgrind:
>
> ==4423== Conditional jump or move depends on uninitialised value(s)
> ==4423== at 0x242FA9: cleanup_path (path.c:35)
[...]
> ==4423== Uninitialised value was created by a heap allocation
[...]
> ==4423== by 0x29A30B: strbuf_grow (strbuf.c:66)
> ==4423== by 0x29A30B: strbuf_vaddf (strbuf.c:277)
> ==4423== by 0x242F9F: mkpath (path.c:454)
[...]
> Avoid this by using skip_prefix(), which knows not to go beyond the
> end of the string.
>
> Reported-by: Thomas Gummerer <t.gummerer@gmail.com>
> Signed-off-by: Jeff King <peff@peff.net>
> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
This is indeed
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Thanks.
next prev parent reply other threads:[~2017-10-04 19:36 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-03 19:57 [PATCH 0/3] fixes for running the test suite with --valgrind Thomas Gummerer
2017-10-03 19:57 ` [PATCH 1/3] path.c: fix uninitialized memory access Thomas Gummerer
2017-10-03 22:45 ` Jonathan Nieder
2017-10-03 23:30 ` Jeff King
2017-10-03 23:37 ` Jonathan Nieder
2017-10-04 4:47 ` Junio C Hamano
2017-10-04 5:21 ` Jeff King
2017-10-04 19:22 ` Thomas Gummerer
2017-10-04 19:36 ` Jonathan Nieder [this message]
2017-10-03 19:57 ` [PATCH 2/3] http-push: fix construction of hex value from path Thomas Gummerer
2017-10-03 22:53 ` Jonathan Nieder
2017-10-03 23:36 ` Jeff King
2017-10-04 4:48 ` Junio C Hamano
2017-10-04 5:20 ` Junio C Hamano
2017-10-04 5:26 ` Jeff King
2017-10-04 6:26 ` Junio C Hamano
2017-10-03 19:57 ` [PATCH 3/3] sub-process: allocate argv on the heap Thomas Gummerer
2017-10-03 20:24 ` Johannes Sixt
2017-10-04 4:59 ` Junio C Hamano
2017-10-04 5:32 ` Jeff King
2017-10-04 5:58 ` Johannes Sixt
2017-10-04 19:31 ` Thomas Gummerer
2017-10-03 20:25 ` Stefan Beller
2017-10-03 23:41 ` [PATCH 0/3] fixes for running the test suite with --valgrind Jeff King
2017-10-03 23:50 ` Jonathan Nieder
2017-10-03 23:54 ` Jeff King
2017-10-04 10:19 ` playing with MSan, was " Jeff King
2017-10-04 19:30 ` Thomas Gummerer
2017-10-05 3:46 ` lstat-ing delayed-filter output, was Re: playing with MSan Jeff King
2017-10-05 10:47 ` Lars Schneider
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