[merged mm-nonmm-stable] lib-fonts-fix-undefined-behavior-in-bit-shift-for-get_default_font.patch removed from -mm tree

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The quilt patch titled
     Subject: lib/fonts: fix undefined behavior in bit shift for get_default_font
has been removed from the -mm tree.  Its filename was
     lib-fonts-fix-undefined-behavior-in-bit-shift-for-get_default_font.patch

This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>
Subject: lib/fonts: fix undefined behavior in bit shift for get_default_font
Date: Mon, 31 Oct 2022 19:38:29 +0800

Shifting signed 32-bit value by 31 bits is undefined, so changing
significant bit to unsigned.  The UBSAN warning calltrace like below:

UBSAN: shift-out-of-bounds in lib/fonts/fonts.c:139:20
left shift of 1 by 31 places cannot be represented in type 'int'
 <TASK>
 dump_stack_lvl+0x7d/0xa5
 dump_stack+0x15/0x1b
 ubsan_epilogue+0xe/0x4e
 __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c
 get_default_font+0x1c7/0x1f0
 fbcon_startup+0x347/0x3a0
 do_take_over_console+0xce/0x270
 do_fbcon_takeover+0xa1/0x170
 do_fb_registered+0x2a8/0x340
 fbcon_fb_registered+0x47/0xe0
 register_framebuffer+0x294/0x4a0
 __drm_fb_helper_initial_config_and_unlock+0x43c/0x880 [drm_kms_helper]
 drm_fb_helper_initial_config+0x52/0x80 [drm_kms_helper]
 drm_fbdev_client_hotplug+0x156/0x1b0 [drm_kms_helper]
 drm_fbdev_generic_setup+0xfc/0x290 [drm_kms_helper]
 bochs_pci_probe+0x6ca/0x772 [bochs]
 local_pci_probe+0x4d/0xb0
 pci_device_probe+0x119/0x320
 really_probe+0x181/0x550
 __driver_probe_device+0xc6/0x220
 driver_probe_device+0x32/0x100
 __driver_attach+0x195/0x200
 bus_for_each_dev+0xbb/0x120
 driver_attach+0x27/0x30
 bus_add_driver+0x22e/0x2f0
 driver_register+0xa9/0x190
 __pci_register_driver+0x90/0xa0
 bochs_pci_driver_init+0x52/0x1000 [bochs]
 do_one_initcall+0x76/0x430
 do_init_module+0x61/0x28a
 load_module+0x1f82/0x2e50
 __do_sys_finit_module+0xf8/0x190
 __x64_sys_finit_module+0x23/0x30
 do_syscall_64+0x58/0x80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
 </TASK>

Link: https://lkml.kernel.org/r/20221031113829.4183153-1-cuigaosheng1@xxxxxxxxxx
Fixes: c81f717cb9e0 ("fbcon: Fix typo and bogus logic in get_default_font")
Signed-off-by: Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 lib/fonts/fonts.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/lib/fonts/fonts.c~lib-fonts-fix-undefined-behavior-in-bit-shift-for-get_default_font
+++ a/lib/fonts/fonts.c
@@ -135,8 +135,8 @@ const struct font_desc *get_default_font
 		if (res > 20)
 			c += 20 - res;
 
-		if ((font_w & (1 << (f->width - 1))) &&
-		    (font_h & (1 << (f->height - 1))))
+		if ((font_w & (1U << (f->width - 1))) &&
+		    (font_h & (1U << (f->height - 1))))
 			c += 1000;
 
 		if (c > cc) {
_

Patches currently in -mm which might be from cuigaosheng1@xxxxxxxxxx are





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