From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Junxiao Bi <junxiao.bi@oracle.com>,
Sumit Saxena <sumit.saxena@broadcom.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
Sasha Levin <sashal@kernel.org>,
megaraidlinux.pdl@broadcom.com, linux-scsi@vger.kernel.org
Subject: [PATCH AUTOSEL 4.9 18/22] scsi: megaraid_sas: fix panic on loading firmware crashdump
Date: Fri, 2 Aug 2019 09:25:42 -0400 [thread overview]
Message-ID: <20190802132547.14517-18-sashal@kernel.org> (raw)
In-Reply-To: <20190802132547.14517-1-sashal@kernel.org>
From: Junxiao Bi <junxiao.bi@oracle.com>
[ Upstream commit 3b5f307ef3cb5022bfe3c8ca5b8f2114d5bf6c29 ]
While loading fw crashdump in function fw_crash_buffer_show(), left bytes
in one dma chunk was not checked, if copying size over it, overflow access
will cause kernel panic.
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/megaraid/megaraid_sas_base.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 5b1c37e3913cd..d90693b2767fd 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -2847,6 +2847,7 @@ megasas_fw_crash_buffer_show(struct device *cdev,
u32 size;
unsigned long buff_addr;
unsigned long dmachunk = CRASH_DMA_BUF_SIZE;
+ unsigned long chunk_left_bytes;
unsigned long src_addr;
unsigned long flags;
u32 buff_offset;
@@ -2872,6 +2873,8 @@ megasas_fw_crash_buffer_show(struct device *cdev,
}
size = (instance->fw_crash_buffer_size * dmachunk) - buff_offset;
+ chunk_left_bytes = dmachunk - (buff_offset % dmachunk);
+ size = (size > chunk_left_bytes) ? chunk_left_bytes : size;
size = (size >= PAGE_SIZE) ? (PAGE_SIZE - 1) : size;
src_addr = (unsigned long)instance->crash_buf[buff_offset / dmachunk] +
--
2.20.1
next prev parent reply other threads:[~2019-08-02 13:26 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-02 13:25 [PATCH AUTOSEL 4.9 01/22] netfilter: nfnetlink: avoid deadlock due to synchronous request_module Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 02/22] iscsi_ibft: make ISCSI_IBFT dependson ACPI instead of ISCSI_IBFT_FIND Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 03/22] mac80211: don't warn about CW params when not using them Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 04/22] hwmon: (nct6775) Fix register address and added missed tolerance for nct6106 Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 05/22] x86/mm: Check for pfn instead of page in vmalloc_sync_one() Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 06/22] x86/mm: Sync also unmappings in vmalloc_sync_all() Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 07/22] drm/msm: stop abusing dma_map/unmap for cache Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 08/22] cpufreq/pasemi: fix use-after-free in pas_cpufreq_cpu_init() Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 09/22] s390/qdio: add sanity checks to the fast-requeue path Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 10/22] ALSA: compress: Fix regression on compressed capture streams Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 11/22] ALSA: compress: Prevent bypasses of set_params Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 12/22] ALSA: compress: Don't allow paritial drain operations on capture streams Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 13/22] ALSA: compress: Be more restrictive about when a drain is allowed Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 14/22] perf probe: Avoid calling freeing routine multiple times for same pointer Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 15/22] drbd: dynamically allocate shash descriptor Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 16/22] ACPI/IORT: Fix off-by-one check in iort_dev_find_its_id() Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 17/22] ARM: davinci: fix sleep.S build error on ARMv4 Sasha Levin
2019-08-02 13:25 ` Sasha Levin [this message]
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 19/22] scsi: ibmvfc: fix WARN_ON during event pool release Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 20/22] scsi: scsi_dh_alua: always use a 2 second delay before retrying RTPG Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 21/22] tty/ldsem, locking/rwsem: Add missing ACQUIRE to read_failed sleep loop Sasha Levin
2019-08-02 13:25 ` [PATCH AUTOSEL 4.9 22/22] perf/core: Fix creating kernel counters for PMUs that override event->cpu Sasha Levin
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