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scsi: qedf: Do not touch __user pointer in qedf_dbg_debug_cmd_read() directly
[ Upstream commit31b5991a9a
] The qedf_dbg_debug_cmd_read() function invokes sprintf() directly on a __user pointer, which may crash the kernel. Avoid doing that by using a small on-stack buffer for scnprintf() and then calling simple_read_from_buffer() which does a proper copy_to_user() call. Fixes:61d8658b4a
("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.") Link: https://lore.kernel.org/lkml/20230724120241.40495-1-oleksandr@redhat.com/ Link: https://lore.kernel.org/linux-scsi/20230726101236.11922-1-skashyap@marvell.com/ Cc: Saurav Kashyap <skashyap@marvell.com> Cc: Rob Evers <revers@redhat.com> Cc: Johannes Thumshirn <Johannes.Thumshirn@wdc.com> Cc: David Laight <David.Laight@ACULAB.COM> Cc: Jozef Bacik <jobacik@redhat.com> Cc: Laurence Oberman <loberman@redhat.com> Cc: "James E.J. Bottomley" <jejb@linux.ibm.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: GR-QLogic-Storage-Upstream@marvell.com Cc: linux-scsi@vger.kernel.org Reviewed-by: Laurence Oberman <loberman@redhat.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Tested-by: Laurence Oberman <loberman@redhat.com> Acked-by: Saurav Kashyap <skashyap@marvell.com> Signed-off-by: Oleksandr Natalenko <oleksandr@redhat.com> Link: https://lore.kernel.org/r/20230731084034.37021-3-oleksandr@redhat.com Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 3 additions and 4 deletions
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@ -138,15 +138,14 @@ qedf_dbg_debug_cmd_read(struct file *filp, char __user *buffer, size_t count,
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loff_t *ppos)
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{
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int cnt;
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char cbuf[32];
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struct qedf_dbg_ctx *qedf_dbg =
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(struct qedf_dbg_ctx *)filp->private_data;
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QEDF_INFO(qedf_dbg, QEDF_LOG_DEBUGFS, "debug mask=0x%x\n", qedf_debug);
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cnt = sprintf(buffer, "debug mask = 0x%x\n", qedf_debug);
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cnt = scnprintf(cbuf, sizeof(cbuf), "debug mask = 0x%x\n", qedf_debug);
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cnt = min_t(int, count, cnt - *ppos);
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*ppos += cnt;
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return cnt;
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return simple_read_from_buffer(buffer, count, ppos, cbuf, cnt);
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}
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static ssize_t
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