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From 54a9827172d4fb94447e81f598200c7d5d41db05 Mon Sep 17 00:00:00 2001
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From: Jeremy Kerr <jk@ozlabs.org>
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Date: Tue, 6 Sep 2016 13:32:03 +0800
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Subject: [PATCH 35/43] devtree: Don't overrun dimminfo buffer
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The SPD size fields report the total size of the SPD, but we're reading
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into 128-bytes beyond the start of our spd buffer. So, we currently
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overrung our stack-allocated dimminfo buffer.
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This change takes account of the data we've already read.
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
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---
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src/core/device-tree.cc | 8 ++++++--
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1 file changed, 6 insertions(+), 2 deletions(-)
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diff --git a/src/core/device-tree.cc b/src/core/device-tree.cc
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index 2d908d2..e286ab4 100644
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--- a/src/core/device-tree.cc
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+++ b/src/core/device-tree.cc
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@@ -763,6 +763,7 @@ static void add_memory_bank_spd(string path, hwNode & bank)
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unsigned char partno_offset;
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unsigned char ver_offset;
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int fd;
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+ size_t len = 0;
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dimminfo_buf dimminfo;
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fd = open(path.c_str(), O_RDONLY);
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@@ -778,11 +779,14 @@ static void add_memory_bank_spd(string path, hwNode & bank)
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/* Read entire SPD eeprom */
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if (dimminfo[2] >= 9) /* DDR3 */
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{
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- read(fd, &dimminfo[0x80], (64 << ((dimminfo[0] & 0x70) >> 4)));
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+ len = 64 << ((dimminfo[0] & 0x70) >> 4);
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} else if (dimminfo[0] < 15) { /* DDR 2 */
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- read(fd, &dimminfo[0x80], (1 << (dimminfo[1])));
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+ len = 1 << dimminfo[1];
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}
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+ if (len > 0x80)
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+ read(fd, &dimminfo[0x80], len - 0x80);
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+
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close(fd);
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if (dimminfo[2] >= 9) {
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--
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2.10.2
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