From b4fe0d7d41eacf3c2ffa54eef3e5e93ac8777518 Mon Sep 17 00:00:00 2001 From: "Mike Rapoport (Microsoft)" Date: Sat, 4 Jul 2026 09:13:35 +0300 Subject: [PATCH] scsi: proc: Use kmalloc() in proc writers proc_scsi_host_write(), proc_scsi_write() and proc_scsi_devinfo_write() allocate temporary buffers for /proc writes using __get_free_page(). These buffers can be allocated with kmalloc() as there's nothing special about them to go directly to the page allocator. kmalloc() provides a better API that does not require ugly casts and kfree() does not need to know the size of the freed object. Replace use of __get_free_page() with kmalloc(). Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com Reviewed-by: Hannes Reinecke Reviewed-by: John Garry Signed-off-by: Mike Rapoport (Microsoft) Link: https://patch.msgid.link/20260704-b4-scsi-v2-2-7d2d21a810de@kernel.org Signed-off-by: Martin K. Petersen (Oracle) --- drivers/scsi/scsi_devinfo.c | 5 +++-- drivers/scsi/scsi_proc.c | 9 +++++---- 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c index 15ffbe93ac72..2bccadf4f22f 100644 --- a/drivers/scsi/scsi_devinfo.c +++ b/drivers/scsi/scsi_devinfo.c @@ -691,7 +691,8 @@ static ssize_t proc_scsi_devinfo_write(struct file *file, if (!buf || length>PAGE_SIZE) return -EINVAL; - if (!(buffer = (char *) __get_free_page(GFP_KERNEL))) + buffer = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!buffer) return -ENOMEM; if (copy_from_user(buffer, buf, length)) { err =-EFAULT; @@ -708,7 +709,7 @@ static ssize_t proc_scsi_devinfo_write(struct file *file, scsi_dev_info_list_add_str(buffer); out: - free_page((unsigned long)buffer); + kfree(buffer); return err; } diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c index 1799dcae775c..fdc355d783da 100644 --- a/drivers/scsi/scsi_proc.c +++ b/drivers/scsi/scsi_proc.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -74,7 +75,7 @@ static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf, if (!shost->hostt->write_info) return -EINVAL; - page = (char *)__get_free_page(GFP_KERNEL); + page = kmalloc(PAGE_SIZE, GFP_KERNEL); if (page) { ret = -EFAULT; if (copy_from_user(page, buf, count)) @@ -82,7 +83,7 @@ static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf, ret = shost->hostt->write_info(shost, page, count); } out: - free_page((unsigned long)page); + kfree(page); return ret; } @@ -412,7 +413,7 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf, if (!buf || length > PAGE_SIZE) return -EINVAL; - buffer = (char *)__get_free_page(GFP_KERNEL); + buffer = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!buffer) return -ENOMEM; @@ -467,7 +468,7 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf, err = length; out: - free_page((unsigned long)buffer); + kfree(buffer); return err; }