From: Paolo Bonzini <pbonzini@redhat.com>
To: Stefan Weil <sw@weilnetz.de>,
Shannon Zhao <zhaoshenglong@huawei.com>,
qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, hangaohuai@huawei.com,
qemu-trivial@nongnu.org, mjt@tls.msk.ru,
peter.huangpeng@huawei.com, shannon.zhao@linaro.org
Subject: Re: [Qemu-trivial] [PATCH] hw/bt/sdp: Fix resource leak detect by coverity
Date: Sun, 15 Mar 2015 10:21:33 +0100 [thread overview]
Message-ID: <55054F1D.2080408@redhat.com> (raw)
In-Reply-To: <55040865.8050908@weilnetz.de>
On 14/03/2015 11:07, Stefan Weil wrote:
>
> This fixes the memory leak, but I still don't understand what is done here.
> data is allocated, then filled with values, now it is also deallocated.
> But I'm missing the part where all those data is used.
"data" escapes in record->attribute_list[record->attributes].pair.
The bug is in bt_l2cap_sdp_close_ch which does an invalid free every
time it frees the first sdp->service_list[i].attribute_list->pair (but
the qsort could have moved it elsewhere in the list). The right fix is
to do a separate malloc for each attribute, instead of a single one.
In any case, it seems simpler to just leave this code aside.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Stefan Weil <sw@weilnetz.de>,
Shannon Zhao <zhaoshenglong@huawei.com>,
qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, hangaohuai@huawei.com,
qemu-trivial@nongnu.org, mjt@tls.msk.ru,
peter.huangpeng@huawei.com, shannon.zhao@linaro.org
Subject: Re: [Qemu-devel] [PATCH] hw/bt/sdp: Fix resource leak detect by coverity
Date: Sun, 15 Mar 2015 10:21:33 +0100 [thread overview]
Message-ID: <55054F1D.2080408@redhat.com> (raw)
In-Reply-To: <55040865.8050908@weilnetz.de>
On 14/03/2015 11:07, Stefan Weil wrote:
>
> This fixes the memory leak, but I still don't understand what is done here.
> data is allocated, then filled with values, now it is also deallocated.
> But I'm missing the part where all those data is used.
"data" escapes in record->attribute_list[record->attributes].pair.
The bug is in bt_l2cap_sdp_close_ch which does an invalid free every
time it frees the first sdp->service_list[i].attribute_list->pair (but
the qsort could have moved it elsewhere in the list). The right fix is
to do a separate malloc for each attribute, instead of a single one.
In any case, it seems simpler to just leave this code aside.
Paolo
next prev parent reply other threads:[~2015-03-15 9:21 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-14 9:47 [Qemu-trivial] [PATCH] hw/bt/sdp: Fix resource leak detect by coverity Shannon Zhao
2015-03-14 9:47 ` [Qemu-devel] " Shannon Zhao
2015-03-14 10:07 ` [Qemu-trivial] " Stefan Weil
2015-03-14 10:07 ` Stefan Weil
2015-03-15 9:21 ` Paolo Bonzini [this message]
2015-03-15 9:21 ` Paolo Bonzini
2015-03-15 10:23 ` [Qemu-trivial] " Michael Tokarev
2015-03-15 10:23 ` [Qemu-devel] " Michael Tokarev
2015-03-15 14:11 ` [Qemu-trivial] " Paolo Bonzini
2015-03-15 14:11 ` [Qemu-devel] " Paolo Bonzini
2015-03-16 7:29 ` [Qemu-trivial] " Markus Armbruster
2015-03-16 7:29 ` Markus Armbruster
2015-03-16 8:13 ` [Qemu-trivial] " Paolo Bonzini
2015-03-16 8:13 ` [Qemu-devel] " Paolo Bonzini
-- strict thread matches above, loose matches on Subject: below --
2015-03-14 3:42 [Qemu-trivial] " Shannon Zhao
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