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| author | Konstantin Khorenko <khorenko@virtuozzo.com> | 2019-04-15 13:17:55 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-16 15:21:34 +0200 |
| commit | fa2b360f261e31f2a54f997095713f91bac0e503 (patch) | |
| tree | b264f487010f0917e842d8cc1e4ccf3fd50b0229 /drivers/tty | |
| parent | tty: remove redundant 'default n' from Kconfig-s (diff) | |
| download | linux-fa2b360f261e31f2a54f997095713f91bac0e503.tar.xz linux-fa2b360f261e31f2a54f997095713f91bac0e503.zip | |
tty/vt: avoid high order pages allocation on GIO_UNIMAP ioctl
GIO_UNIMAP can easily result in a high order allocation,
seen 6th order allocation on radeondrmfb:
fbcon: radeondrmfb (fb0) is primary device
Console: switching to colour frame buffer device 160x64
radeon 0000:01:05.0: fb0: radeondrmfb frame buffer device
WARNING: CPU: 0 PID: 78661 at mm/page_alloc.c:3532
__alloc_pages_nodemask+0x1b1/0x600
order 6 >= 3, gfp 0x40d0
The warning is generated by a debug patch.
At the same time it's safe to use kvmalloc() for allocation in
con_get_unimap(), so let's do the substitution.
And do the same for con_set_unimap().
Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/vt/consolemap.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c index 7c7ada0b3ea0..b28aa0d289f8 100644 --- a/drivers/tty/vt/consolemap.c +++ b/drivers/tty/vt/consolemap.c @@ -542,7 +542,7 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list) if (!ct) return 0; - unilist = memdup_user(list, ct * sizeof(struct unipair)); + unilist = vmemdup_user(list, ct * sizeof(struct unipair)); if (IS_ERR(unilist)) return PTR_ERR(unilist); @@ -641,7 +641,7 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list) out_unlock: console_unlock(); - kfree(unilist); + kvfree(unilist); return err; } @@ -743,7 +743,7 @@ int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct uni struct uni_pagedir *p; struct unipair *unilist; - unilist = kmalloc_array(ct, sizeof(struct unipair), GFP_KERNEL); + unilist = kvmalloc_array(ct, sizeof(struct unipair), GFP_KERNEL); if (!unilist) return -ENOMEM; @@ -775,7 +775,7 @@ int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct uni if (copy_to_user(list, unilist, min(ect, ct) * sizeof(struct unipair))) ret = -EFAULT; put_user(ect, uct); - kfree(unilist); + kvfree(unilist); return ret ? ret : (ect <= ct) ? 0 : -ENOMEM; } |