# \[PATCH\] video: offb: Deallocate the color map - Subsystems: FRAMEBUFFER LAYER, THE REST - Maintainers: Helge Deller, Linus Torvalds - List: linux-fbdev - 2 messages, 2 authors - Page: https://ratatoskr.run/linux-fbdev/2018/02/5208125/t ## \[PATCH\] video: offb: Deallocate the color map - From: Mathieu Malaterre \ - Date: 2018-02-13 18:08:24 - Message: https://ratatoskr.run/linux-fbdev/2018/02/5208125.md ```text The function offb_destroy did not deallocate the color map leaving some memory around after destruction. Call the color map deallocate function to remove the memory leak. Handle another case where color map should have been deallocated during an error code path. Fix memory leaks reported by kmemleak: # dmesg ... [ 1884.719941] kmemleak: 3 new suspected memory leaks (see /sys/kernel/debug/kmemleak) # cat /sys/kernel/debug/kmemleak unreferenced object 0xde3d9000 (size 512): comm "swapper", pid 1, jiffies 4294892827 (age 1906.784s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 aa aa aa aa aa aa aa aa ................ 55 55 55 55 55 55 55 55 ff ff ff ff ff ff ff ff UUUUUUUU........ backtrace: [] fb_alloc_cmap_gfp+0x54/0x15c [] offb_init_nodriver+0x8e8/0xa3c [] offb_init+0xd0/0x164 [<322f82a3>] do_one_initcall+0x4c/0x178 [] kernel_init_freeable+0x138/0x1cc [<2a17fa0e>] kernel_init+0x24/0x118 [<4079749a>] ret_from_kernel_thread+0x5c/0x64 unreferenced object 0xde3d9200 (size 512): comm "swapper", pid 1, jiffies 4294892827 (age 1906.784s) hex dump (first 32 bytes): 00 00 00 00 aa aa aa aa 00 00 00 00 55 55 aa aa ............UU.. 55 55 55 55 ff ff ff ff 55 55 55 55 ff ff ff ff UUUU....UUUU.... backtrace: [<4bf3594d>] fb_alloc_cmap_gfp+0x6c/0x15c [] offb_init_nodriver+0x8e8/0xa3c [] offb_init+0xd0/0x164 [<322f82a3>] do_one_initcall+0x4c/0x178 [] kernel_init_freeable+0x138/0x1cc [<2a17fa0e>] kernel_init+0x24/0x118 [<4079749a>] ret_from_kernel_thread+0x5c/0x64 unreferenced object 0xde3d9600 (size 512): comm "swapper", pid 1, jiffies 4294892827 (age 1906.784s) hex dump (first 32 bytes): 00 00 aa aa 00 00 aa aa 00 00 aa aa 00 00 aa aa ................ 55 55 ff ff 55 55 ff ff 55 55 ff ff 55 55 ff ff UU..UU..UU..UU.. backtrace: [<23a3ea03>] fb_alloc_cmap_gfp+0x84/0x15c [] offb_init_nodriver+0x8e8/0xa3c [] offb_init+0xd0/0x164 [<322f82a3>] do_one_initcall+0x4c/0x178 [] kernel_init_freeable+0x138/0x1cc [<2a17fa0e>] kernel_init+0x24/0x118 [<4079749a>] ret_from_kernel_thread+0x5c/0x64 Signed-off-by: Mathieu Malaterre --- drivers/video/fbdev/offb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/video/fbdev/offb.c b/drivers/video/fbdev/offb.c index 6f65d132eba1..30786445de04 100644 --- a/drivers/video/fbdev/offb.c +++ b/drivers/video/fbdev/offb.c @@ -282,6 +282,7 @@ static void offb_destroy(struct fb_info *info) if (info->screen_base) iounmap(info->screen_base); release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size); + fb_dealloc_cmap(&info->cmap); framebuffer_release(info); } @@ -520,6 +521,7 @@ static void __init offb_init_fb(const char *name, return; out_err: + fb_dealloc_cmap(&info->cmap); iounmap(info->screen_base); out_aper: iounmap(par->cmap_adr); -- 2.11.0 ``` ## Re: \[PATCH\] video: offb: Deallocate the color map - From: Bartlomiej Zolnierkiewicz \ - Date: 2018-03-12 15:31:43 - Message: https://ratatoskr.run/linux-fbdev/2018/03/5234977.md ```text On Tuesday, February 13, 2018 07:07:45 PM Mathieu Malaterre wrote: > The function offb_destroy did not deallocate the color map leaving some > memory around after destruction. Call the color map deallocate function to > remove the memory leak. > > Handle another case where color map should have been deallocated during an > error code path. > > Fix memory leaks reported by kmemleak: > > # dmesg > ... > [ 1884.719941] kmemleak: 3 new suspected memory leaks (see /sys/kernel/debug/kmemleak) > # cat /sys/kernel/debug/kmemleak > unreferenced object 0xde3d9000 (size 512): > comm "swapper", pid 1, jiffies 4294892827 (age 1906.784s) > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 aa aa aa aa aa aa aa aa ................ > 55 55 55 55 55 55 55 55 ff ff ff ff ff ff ff ff UUUUUUUU........ > backtrace: > [] fb_alloc_cmap_gfp+0x54/0x15c > [] offb_init_nodriver+0x8e8/0xa3c > [] offb_init+0xd0/0x164 > [<322f82a3>] do_one_initcall+0x4c/0x178 > [] kernel_init_freeable+0x138/0x1cc > [<2a17fa0e>] kernel_init+0x24/0x118 > [<4079749a>] ret_from_kernel_thread+0x5c/0x64 > unreferenced object 0xde3d9200 (size 512): > comm "swapper", pid 1, jiffies 4294892827 (age 1906.784s) > hex dump (first 32 bytes): > 00 00 00 00 aa aa aa aa 00 00 00 00 55 55 aa aa ............UU.. > 55 55 55 55 ff ff ff ff 55 55 55 55 ff ff ff ff UUUU....UUUU.... > backtrace: > [<4bf3594d>] fb_alloc_cmap_gfp+0x6c/0x15c > [] offb_init_nodriver+0x8e8/0xa3c > [] offb_init+0xd0/0x164 > [<322f82a3>] do_one_initcall+0x4c/0x178 > [] kernel_init_freeable+0x138/0x1cc > [<2a17fa0e>] kernel_init+0x24/0x118 > [<4079749a>] ret_from_kernel_thread+0x5c/0x64 > unreferenced object 0xde3d9600 (size 512): > comm "swapper", pid 1, jiffies 4294892827 (age 1906.784s) > hex dump (first 32 bytes): > 00 00 aa aa 00 00 aa aa 00 00 aa aa 00 00 aa aa ................ > 55 55 ff ff 55 55 ff ff 55 55 ff ff 55 55 ff ff UU..UU..UU..UU.. > backtrace: > [<23a3ea03>] fb_alloc_cmap_gfp+0x84/0x15c > [] offb_init_nodriver+0x8e8/0xa3c > [] offb_init+0xd0/0x164 > [<322f82a3>] do_one_initcall+0x4c/0x178 > [] kernel_init_freeable+0x138/0x1cc > [<2a17fa0e>] kernel_init+0x24/0x118 > [<4079749a>] ret_from_kernel_thread+0x5c/0x64 > > Signed-off-by: Mathieu Malaterre Patch queued for 4.17, thanks. Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics ```