kernel/linux.git/drivers/video, branch v6.1.124

fbdev: sh7760fb: Fix a possible memory leak in sh7760fb_alloc_mem()

2024-12-14T18:53:42+00:00

[ Upstream commit f89d17ae2ac42931be2a0153fecbf8533280c927 ] When information such as info->screen_base is not ready, calling sh7760fb_free_mem() does not release memory correctly. Call dma_free_coherent() instead. Fixes: 4a25e41831ee ("video: sh7760fb: SH7760/SH7763 LCDC framebuffer driver") Signed-off-by: Zhen Lei Reviewed-by: Dmitry Baryshkov Signed-off-by: Helge Deller Signed-off-by: Sasha Levin

fbdev/sh7760fb: Alloc DMA memory from hardware device

2024-12-14T18:53:42+00:00

[ Upstream commit 8404e56f4bc1d1a65bfc98450ba3dae5e653dda1 ] Pass the hardware device to the DMA helpers dma_alloc_coherent() and dma_free_coherent(). The fbdev device that is currently being used is a software device and does not provide DMA memory. Also update the related dev_*() output statements similarly. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Link: https://patchwork.freedesktop.org/patch/msgid/20230613110953.24176-28-tzimmermann@suse.de Stable-dep-of: f89d17ae2ac4 ("fbdev: sh7760fb: Fix a possible memory leak in sh7760fb_alloc_mem()") Signed-off-by: Sasha Levin

fbdev: efifb: Register sysfs groups through driver core

2024-12-14T18:53:13+00:00

[ Upstream commit 95cdd538e0e5677efbdf8aade04ec098ab98f457 ] The driver core can register and cleanup sysfs groups already. Make use of that functionality to simplify the error handling and cleanup. Also avoid a UAF race during unregistering where the sysctl attributes were usable after the info struct was freed. Signed-off-by: Thomas Weißschuh Signed-off-by: Helge Deller Signed-off-by: Sasha Levin Signed-off-by: Xiangyu Chen Signed-off-by: Sasha Levin

fbdev: sisfb: Fix strbuf array overflow

2024-10-17T13:22:18+00:00

[ Upstream commit 9cf14f5a2746c19455ce9cb44341b5527b5e19c3 ] The values of the variables xres and yres are placed in strbuf. These variables are obtained from strbuf1. The strbuf1 array contains digit characters and a space if the array contains non-digit characters. Then, when executing sprintf(strbuf, "%ux%ux8", xres, yres); more than 16 bytes will be written to strbuf. It is suggested to increase the size of the strbuf array to 24. Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Andrey Shumilin Signed-off-by: Helge Deller Signed-off-by: Sasha Levin

fbcon: Fix a NULL pointer dereference issue in fbcon_putcs

2024-10-17T13:22:17+00:00

[ Upstream commit 5b97eebcce1b4f3f07a71f635d6aa3af96c236e7 ] syzbot has found a NULL pointer dereference bug in fbcon. Here is the simplified C reproducer: struct param { uint8_t type; struct tiocl_selection ts; }; int main() { struct fb_con2fbmap con2fb; struct param param; int fd = open("/dev/fb1", 0, 0); con2fb.console = 0x19; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb); param.type = 2; param.ts.xs = 0; param.ts.ys = 0; param.ts.xe = 0; param.ts.ye = 0; param.ts.sel_mode = 0; int fd1 = open("/dev/tty1", O_RDWR, 0); ioctl(fd1, TIOCLINUX, ¶m); con2fb.console = 1; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb); return 0; } After calling ioctl(fd1, TIOCLINUX, ¶m), the subsequent ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb) causes the kernel to follow a different execution path: set_con2fb_map -> con2fb_init_display -> fbcon_set_disp -> redraw_screen -> hide_cursor -> clear_selection -> highlight -> invert_screen -> do_update_region -> fbcon_putcs -> ops->putcs Since ops->putcs is a NULL pointer, this leads to a kernel panic. To prevent this, we need to call set_blitting_type() within set_con2fb_map() to properly initialize ops->putcs. Reported-by: syzbot+3d613ae53c031502687a@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3d613ae53c031502687a Tested-by: syzbot+3d613ae53c031502687a@syzkaller.appspotmail.com Signed-off-by: Qianqiang Liu Signed-off-by: Helge Deller Signed-off-by: Sasha Levin

fbdev: pxafb: Fix possible use after free in pxafb_task()

2024-10-17T13:21:42+00:00

[ Upstream commit 4a6921095eb04a900e0000da83d9475eb958e61e ] In the pxafb_probe function, it calls the pxafb_init_fbinfo function, after which &fbi->task is associated with pxafb_task. Moreover, within this pxafb_init_fbinfo function, the pxafb_blank function within the &pxafb_ops struct is capable of scheduling work. If we remove the module which will call pxafb_remove to make cleanup, it will call unregister_framebuffer function which can call do_unregister_framebuffer to free fbi->fb through put_fb_info(fb_info), while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | pxafb_task pxafb_remove | unregister_framebuffer(info) | do_unregister_framebuffer(fb_info) | put_fb_info(fb_info) | // free fbi->fb | set_ctrlr_state(fbi, state) | __pxafb_lcd_power(fbi, 0) | fbi->lcd_power(on, &fbi->fb.var) | //use fbi->fb Fix it by ensuring that the work is canceled before proceeding with the cleanup in pxafb_remove. Note that only root user can remove the driver at runtime. Signed-off-by: Kaixin Wang Signed-off-by: Helge Deller Signed-off-by: Sasha Levin

fbdev: hpfb: Fix an error handling path in hpfb_dio_probe()

2024-10-17T13:20:49+00:00

[ Upstream commit aa578e897520f32ae12bec487f2474357d01ca9c ] If an error occurs after request_mem_region(), a corresponding release_mem_region() should be called, as already done in the remove function. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Christophe JAILLET Signed-off-by: Helge Deller Signed-off-by: Sasha Levin

fbdev: offb: fix up missing cleanup.h

2024-09-04T11:25:05+00:00

In commit 96ee5c5712ef ("fbdev: offb: replace of_node_put with __free(device_node)"), __free() was added, but not cleanup.h so it broke the build. Fix this up. Reported-by: Guenter Roeck Link: https://lore.kernel.org/r/4f4ac35e-e31c-4f67-b809-a5de4d4b273a@roeck-us.net Fixes: 96ee5c5712ef ("fbdev: offb: replace of_node_put with __free(device_node)") Cc: Julia Lawall Cc: Abdulrasaq Lawani Cc: Helge Deller Cc: Sasha Levin Signed-off-by: Greg Kroah-Hartman

fbdev: offb: replace of_node_put with __free(device_node)

2024-08-29T15:30:40+00:00

[ Upstream commit ce4a7ae84a58b9f33aae8d6c769b3c94f3d5ce76 ] Replaced instance of of_node_put with __free(device_node) to simplify code and protect against any memory leaks due to future changes in the control flow. Suggested-by: Julia Lawall Signed-off-by: Abdulrasaq Lawani Signed-off-by: Helge Deller Signed-off-by: Sasha Levin

fbdev: savage: Handle err return when savagefb_check_var failed

2024-06-16T11:41:36+00:00

commit 6ad959b6703e2c4c5d7af03b4cfd5ff608036339 upstream. The commit 04e5eac8f3ab("fbdev: savage: Error out if pixclock equals zero") checks the value of pixclock to avoid divide-by-zero error. However the function savagefb_probe doesn't handle the error return of savagefb_check_var. When pixclock is 0, it will cause divide-by-zero error. Fixes: 04e5eac8f3ab ("fbdev: savage: Error out if pixclock equals zero") Signed-off-by: Cai Xinchen Cc: stable@vger.kernel.org Signed-off-by: Helge Deller Signed-off-by: Greg Kroah-Hartman