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Koen Kooi
6203cbca5c
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
76 lines
2.5 KiB
Diff
76 lines
2.5 KiB
Diff
From 8d14ccd4bd5dab58984030c13a71953d396e792d Mon Sep 17 00:00:00 2001
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From: Roland Dreier <roland@purestorage.com>
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Date: Mon, 16 Jul 2012 15:34:24 -0700
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Subject: [PATCH 43/73] target: Fix possible integer underflow in UNMAP
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emulation
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commit b7fc7f3777582dea85156a821d78a522a0c083aa upstream.
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It's possible for an initiator to send us an UNMAP command with a
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descriptor that is less than 8 bytes; in that case it's really bad for
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us to set an unsigned int to that value, subtract 8 from it, and then
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use that as a limit for our loop (since the value will wrap around to
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a huge positive value).
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Fix this by making size be signed and only looping if size >= 16 (ie
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if we have at least a full descriptor available).
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Also remove offset as an obfuscated name for the constant 8.
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Signed-off-by: Roland Dreier <roland@purestorage.com>
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Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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[bwh: Backported to 3.2: adjust filename, context]
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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drivers/target/target_core_cdb.c | 20 ++++++++++----------
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1 files changed, 10 insertions(+), 10 deletions(-)
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diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
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index b1f5cf0..00f0f7d 100644
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--- a/drivers/target/target_core_cdb.c
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+++ b/drivers/target/target_core_cdb.c
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@@ -1115,9 +1115,10 @@ int target_emulate_unmap(struct se_task *task)
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struct se_device *dev = cmd->se_dev;
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unsigned char *buf, *ptr = NULL;
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sector_t lba;
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- unsigned int size = cmd->data_length, range;
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- int ret = 0, offset;
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- unsigned short dl, bd_dl;
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+ int size = cmd->data_length;
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+ u32 range;
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+ int ret = 0;
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+ int dl, bd_dl;
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if (!dev->transport->do_discard) {
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pr_err("UNMAP emulation not supported for: %s\n",
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@@ -1126,20 +1127,19 @@ int target_emulate_unmap(struct se_task *task)
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return -ENOSYS;
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}
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- /* First UNMAP block descriptor starts at 8 byte offset */
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- offset = 8;
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- size -= 8;
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-
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buf = transport_kmap_data_sg(cmd);
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dl = get_unaligned_be16(&buf[0]);
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bd_dl = get_unaligned_be16(&buf[2]);
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- ptr = &buf[offset];
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- pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
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+ size = min(size - 8, bd_dl);
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+
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+ /* First UNMAP block descriptor starts at 8 byte offset */
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+ ptr = &buf[8];
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+ pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
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" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
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- while (size) {
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+ while (size >= 16) {
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lba = get_unaligned_be64(&ptr[0]);
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range = get_unaligned_be32(&ptr[8]);
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pr_debug("UNMAP: Using lba: %llu and range: %u\n",
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--
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1.7.7.6
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