linux-stable.git/drivers/video/fbdev, branch v4.19.129

video: fbdev: w100fb: Fix a potential double free.

2020-06-22T07:05:06+00:00

commit 18722d48a6bb9c2e8d046214c0a5fd19d0a7c9f6 upstream.

Some memory is vmalloc'ed in the 'w100fb_save_vidmem' function and freed in
the 'w100fb_restore_vidmem' function. (these functions are called
respectively from the 'suspend' and the 'resume' functions)

However, it is also freed in the 'remove' function.

In order to avoid a potential double free, set the corresponding pointer
to NULL once freed in the 'w100fb_restore_vidmem' function.

Fixes: aac51f09d96a ("[PATCH] w100fb: Rewrite for platform independence")
Cc: Richard Purdie 
Cc: Antonino Daplas 
Cc: Bartlomiej Zolnierkiewicz 
Cc:  # v2.6.14+
Signed-off-by: Christophe JAILLET 
Signed-off-by: Sam Ravnborg 
Link: https://patchwork.freedesktop.org/patch/msgid/20200506181902.193290-1-christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman

fbdev: potential information leak in do_fb_ioctl()

2020-04-23T08:30:22+00:00

commit d3d19d6fc5736a798b118971935ce274f7deaa82 upstream.

The "fix" struct has a 2 byte hole after ->ywrapstep and the
"fix = info->fix;" assignment doesn't necessarily clear it.  It depends
on the compiler.  The solution is just to replace the assignment with an
memcpy().

Fixes: 1f5e31d7e55a ("fbmem: don't call copy_from/to_user() with mutex held")
Signed-off-by: Dan Carpenter 
Cc: Andrew Morton 
Cc: Arnd Bergmann 
Cc: "Eric W. Biederman" 
Cc: Andrea Righi 
Cc: Daniel Vetter 
Cc: Sam Ravnborg 
Cc: Maarten Lankhorst 
Cc: Daniel Thompson 
Cc: Peter Rosin 
Cc: Jani Nikula 
Cc: Gerd Hoffmann 
Signed-off-by: Bartlomiej Zolnierkiewicz 
Link: https://patchwork.freedesktop.org/patch/msgid/20200113100132.ixpaymordi24n3av@kili.mountain
Signed-off-by: Greg Kroah-Hartman

video: fbdev: sis: Remove unnecessary parentheses and commented code

2020-04-23T08:30:15+00:00

commit 864eb1afc60cb43e7df879b97f8ca0d719bbb735 upstream.

Clang warns when multiple pairs of parentheses are used for a single
conditional statement.

drivers/video/fbdev/sis/init301.c:851:42: warning: equality comparison
with extraneous parentheses [-Wparentheses-equality]
      } else if((SiS_Pr->SiS_IF_DEF_LVDS == 1) /* ||
                 ~~~~~~~~~~~~~~~~~~~~~~~~^~~~
drivers/video/fbdev/sis/init301.c:851:42: note: remove extraneous
parentheses around the comparison to silence this warning
      } else if((SiS_Pr->SiS_IF_DEF_LVDS == 1) /* ||
                ~                        ^   ~
drivers/video/fbdev/sis/init301.c:851:42: note: use '=' to turn this
equality comparison into an assignment
      } else if((SiS_Pr->SiS_IF_DEF_LVDS == 1) /* ||
                                         ^~
                                         =
1 warning generated.

Remove the parentheses and while we're at it, clean up the commented
code, which has been here since the beginning of git history.

Link: https://github.com/ClangBuiltLinux/linux/issues/118
Signed-off-by: Nathan Chancellor 
Cc: Thomas Winischhofer 
Signed-off-by: Bartlomiej Zolnierkiewicz 
Signed-off-by: Greg Kroah-Hartman

fbcon: fix null-ptr-deref in fbcon_switch

2020-04-13T08:45:14+00:00

commit b139f8b00db4a8ea75a4174346eafa48041aa489 upstream.

Set logo_shown to FBCON_LOGO_CANSHOW when the vc was deallocated.

syzkaller report: https://lkml.org/lkml/2020/3/27/403
general protection fault, probably for non-canonical address
0xdffffc000000006c: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000360-0x0000000000000367]
RIP: 0010:fbcon_switch+0x28f/0x1740
drivers/video/fbdev/core/fbcon.c:2260

Call Trace:
redraw_screen+0x2a8/0x770 drivers/tty/vt/vt.c:1008
vc_do_resize+0xfe7/0x1360 drivers/tty/vt/vt.c:1295
fbcon_init+0x1221/0x1ab0 drivers/video/fbdev/core/fbcon.c:1219
visual_init+0x305/0x5c0 drivers/tty/vt/vt.c:1062
do_bind_con_driver+0x536/0x890 drivers/tty/vt/vt.c:3542
do_take_over_console+0x453/0x5b0 drivers/tty/vt/vt.c:4122
do_fbcon_takeover+0x10b/0x210 drivers/video/fbdev/core/fbcon.c:588
fbcon_fb_registered+0x26b/0x340 drivers/video/fbdev/core/fbcon.c:3259
do_register_framebuffer drivers/video/fbdev/core/fbmem.c:1664 [inline]
register_framebuffer+0x56e/0x980 drivers/video/fbdev/core/fbmem.c:1832
dlfb_usb_probe.cold+0x1743/0x1ba3 drivers/video/fbdev/udlfb.c:1735
usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:374

accessing vc_cons[logo_shown].d->vc_top causes the bug.

Reported-by: syzbot+732528bae351682f1f27@syzkaller.appspotmail.com
Signed-off-by: Qiujun Huang 
Acked-by: Sam Ravnborg 
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter 
Link: https://patchwork.freedesktop.org/patch/msgid/20200329085647.25133-1-hqjagain@gmail.com
Signed-off-by: Greg Kroah-Hartman

pxa168fb: Fix the function used to release some memory in an error handling path

2020-02-24T07:34:36+00:00

[ Upstream commit 3c911fe799d1c338d94b78e7182ad452c37af897 ]

In the probe function, some resources are allocated using 'dma_alloc_wc()',
they should be released with 'dma_free_wc()', not 'dma_free_coherent()'.

We already use 'dma_free_wc()' in the remove function, but not in the
error handling path of the probe function.

Also, remove a useless 'PAGE_ALIGN()'. 'info->fix.smem_len' is already
PAGE_ALIGNed.

Fixes: 638772c7553f ("fb: add support of LCD display controller on pxa168/910 (base layer)")
Signed-off-by: Christophe JAILLET 
Reviewed-by: Lubomir Rintel 
CC: YueHaibing 
Signed-off-by: Bartlomiej Zolnierkiewicz 
Link: https://patchwork.freedesktop.org/patch/msgid/20190831100024.3248-1-christophe.jaillet@wanadoo.fr
Signed-off-by: Sasha Levin

fbdev: chipsfb: remove set but not used variable 'size'

2020-01-27T13:50:21+00:00

[ Upstream commit 8e71fa5e4d86bedfd26df85381d65d6b4c860020 ]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/video/fbdev/chipsfb.c: In function 'chipsfb_pci_init':
drivers/video/fbdev/chipsfb.c:352:22: warning:
 variable 'size' set but not used [-Wunused-but-set-variable]

Fixes: 8c8709334cec ("[PATCH] ppc32: Remove CONFIG_PMAC_PBOOK").
Signed-off-by: YueHaibing 
Acked-by: Michael Ellerman 
Cc: Daniel Vetter 
Cc: Christophe Leroy 
[b.zolnierkie: minor commit summary and description fixups]
Signed-off-by: Bartlomiej Zolnierkiewicz 
Signed-off-by: Sasha Levin

fbdev: fix broken menu dependencies

2019-11-24T07:20:37+00:00

[ Upstream commit aae3394ef0ef90cf00a21133357448385f13a5d4 ]

The framebuffer options and devices menu is unintentionally split
or broken because some items in it do not depend on FB (including
several under omap and mmp).
Fix this by moving FB_CMDLINE, FB_NOTIFY, and FB_CLPS711X_OLD to
just before the FB Kconfig symbol definition and by moving the
omap, omap2, and mmp menus to last, following FB_SM712.

Also, the FB_VIA dependencies are duplicated by both being inside
an "if FB_VIA/endif" block and "depends on FB_VIA", so drop the
"depends on FB_VIA" lines since they are redundant.

Fixes: ea6763c104c9 ("video/fbdev: Always built-in video= cmdline parsing")
Fixes: 5ec9653806ba ("fbdev: Make fb-notify a no-op if CONFIG_FB=n")
Fixes: ef74d46a4ef3 ("video: clps711x: Add new Cirrus Logic CLPS711X framebuffer driver")

Signed-off-by: Randy Dunlap 
Cc: Ezequiel Garcia 
Cc: Daniel Vetter 
Cc: Alexander Shiyan 
Signed-off-by: Bartlomiej Zolnierkiewicz 
Signed-off-by: Sasha Levin

fbdev: sbuslib: integer overflow in sbusfb_ioctl_helper()

2019-11-24T07:20:36+00:00

[ Upstream commit e5017716adb8aa5c01c52386c1b7470101ffe9c5 ]

The "index + count" addition can overflow.  Both come directly from the
user.  This bug leads to an information leak.

Signed-off-by: Dan Carpenter 
Cc: Peter Malone 
Cc: Philippe Ombredanne 
Cc: Mathieu Malaterre 
Signed-off-by: Bartlomiej Zolnierkiewicz 
Signed-off-by: Sasha Levin

fbdev: sbuslib: use checked version of put_user()

2019-11-24T07:20:35+00:00

[ Upstream commit d8bad911e5e55e228d59c0606ff7e6b8131ca7bf ]

I'm not sure why the code assumes that only the first put_user() needs
an access_ok() check.  I have made all the put_user() and get_user()
calls checked.

Signed-off-by: Dan Carpenter 
Cc: Philippe Ombredanne 
Cc: Mathieu Malaterre 
Cc: Peter Malone ,
Signed-off-by: Bartlomiej Zolnierkiewicz 
Signed-off-by: Sasha Levin

atmel_lcdfb: support native-mode display-timings

2019-11-24T07:20:35+00:00

[ Upstream commit 60e5e48dba72c6b59a7a9c7686ba320766913368 ]

When a device tree set a display-timing using native-mode
then according to the bindings doc this should:

    native-mode:
    The native mode for the display, in case multiple
    modes are provided.
    When omitted, assume the first node is the native.

The atmel_lcdfb used the last timing subnode and did not
respect the timing mode specified with native-mode.

Introduce use of of_get_videomode() which allowed
a nice simplification of the code while also
added support for native-mode.

As a nice side-effect this fixes a memory leak where the
data used for timings and the display_np was not freed.

Signed-off-by: Sam Ravnborg 
Cc: Nicolas Ferre 
Cc: Alexandre Belloni 
Signed-off-by: Bartlomiej Zolnierkiewicz 
Signed-off-by: Sasha Levin