49 lines
1.5 KiB
Diff
49 lines
1.5 KiB
Diff
From 025b11465d086c55948eff484f40c993f2184990 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= <thomas@t-8ch.de>
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Date: Fri, 12 Jan 2024 08:47:50 +0100
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Subject: [PATCH] libblkid: avoid aligning out of probing area
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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When reading from the end of the device the IO size alignment could
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enlarge the read buffer outside of the probing area.
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This would then trigger a read failure.
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Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
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Reference:https://github.com/util-linux/util-linux/commit/025b11465d086c55948eff484f40c993f2184990
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Conflict:Context adapt
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---
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libblkid/src/probe.c | 11 ++++++++---
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1 file changed, 8 insertions(+), 3 deletions(-)
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diff --git a/libblkid/src/probe.c b/libblkid/src/probe.c
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index fee5b55..0e716b5 100644
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--- a/libblkid/src/probe.c
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+++ b/libblkid/src/probe.c
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@@ -648,13 +648,18 @@ static int hide_buffer(blkid_probe pr, uint64_t off, uint64_t len)
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unsigned char *blkid_probe_get_buffer(blkid_probe pr, uint64_t off, uint64_t len)
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{
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struct blkid_bufinfo *bf = NULL;
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- uint64_t real_off, bias;
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+ uint64_t real_off, bias, len_align;
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bias = off % pr->io_size;
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off -= bias;
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len += bias;
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- if (len % pr->io_size)
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- len += pr->io_size - (len % pr->io_size);
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+
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+ if (len % pr->io_size) {
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+ len_align = pr->io_size - (len % pr->io_size);
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+
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+ if (pr->off + off + len + len_align <= pr->size)
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+ len += len_align;
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+ }
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real_off = pr->off + off;
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--
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2.33.0
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