From: Kevin Hao <haokexin@xxxxxxxxx> This patch has been added to the 3.12 stable tree. If you have any objections, please let us know. =============== commit a152056c912db82860a8b4c23d0bd3a5aa89e363 upstream. I got the following panic on my fsl p5020ds board. Unable to handle kernel paging request for data at address 0x7375627379737465 Faulting instruction address: 0xc000000000100778 Oops: Kernel access of bad area, sig: 11 [#1] SMP NR_CPUS=24 CoreNet Generic Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.15.0-next-20140613 #145 task: c0000000fe080000 ti: c0000000fe088000 task.ti: c0000000fe088000 NIP: c000000000100778 LR: c00000000010073c CTR: 0000000000000000 REGS: c0000000fe08aa00 TRAP: 0300 Not tainted (3.15.0-next-20140613) MSR: 0000000080029000 <CE,EE,ME> CR: 24ad2e24 XER: 00000000 DEAR: 7375627379737465 ESR: 0000000000000000 SOFTE: 1 GPR00: c0000000000c99b0 c0000000fe08ac80 c0000000009598e0 c0000000fe001d80 GPR04: 00000000000000d0 0000000000000913 c000000007902b20 0000000000000000 GPR08: c0000000feaae888 0000000000000000 0000000007091000 0000000000200200 GPR12: 0000000028ad2e28 c00000000fff4000 c0000000007abe08 0000000000000000 GPR16: c0000000007ab160 c0000000007aaf98 c00000000060ba68 c0000000007abda8 GPR20: c0000000007abde8 c0000000feaea6f8 c0000000feaea708 c0000000007abd10 GPR24: c000000000989370 c0000000008c6228 00000000000041ed c0000000fe00a400 GPR28: c00000000017c1cc 00000000000000d0 7375627379737465 c0000000fe001d80 NIP [c000000000100778] .__kmalloc_track_caller+0x70/0x168 LR [c00000000010073c] .__kmalloc_track_caller+0x34/0x168 Call Trace: [c0000000fe08ac80] [c00000000087e6b8] uevent_sock_list+0x0/0x10 (unreliable) [c0000000fe08ad20] [c0000000000c99b0] .kstrdup+0x44/0x90 [c0000000fe08adc0] [c00000000017c1cc] .__kernfs_new_node+0x4c/0x130 [c0000000fe08ae70] [c00000000017d7e4] .kernfs_new_node+0x2c/0x64 [c0000000fe08aef0] [c00000000017db00] .kernfs_create_dir_ns+0x34/0xc8 [c0000000fe08af80] [c00000000018067c] .sysfs_create_dir_ns+0x58/0xcc [c0000000fe08b010] [c0000000002c711c] .kobject_add_internal+0xc8/0x384 [c0000000fe08b0b0] [c0000000002c7644] .kobject_add+0x64/0xc8 [c0000000fe08b140] [c000000000355ebc] .device_add+0x11c/0x654 [c0000000fe08b200] [c0000000002b5988] .add_disk+0x20c/0x4b4 [c0000000fe08b2c0] [c0000000003a21d4] .add_mtd_blktrans_dev+0x340/0x514 [c0000000fe08b350] [c0000000003a3410] .mtdblock_add_mtd+0x74/0xb4 [c0000000fe08b3e0] [c0000000003a32cc] .blktrans_notify_add+0x64/0x94 [c0000000fe08b470] [c00000000039b5b4] .add_mtd_device+0x1d4/0x368 [c0000000fe08b520] [c00000000039b830] .mtd_device_parse_register+0xe8/0x104 [c0000000fe08b5c0] [c0000000003b8408] .of_flash_probe+0x72c/0x734 [c0000000fe08b750] [c00000000035ba40] .platform_drv_probe+0x38/0x84 [c0000000fe08b7d0] [c0000000003599a4] .really_probe+0xa4/0x29c [c0000000fe08b870] [c000000000359d3c] .__driver_attach+0x100/0x104 [c0000000fe08b900] [c00000000035746c] .bus_for_each_dev+0x84/0xe4 [c0000000fe08b9a0] [c0000000003593c0] .driver_attach+0x24/0x38 [c0000000fe08ba10] [c000000000358f24] .bus_add_driver+0x1c8/0x2ac [c0000000fe08bab0] [c00000000035a3a4] .driver_register+0x8c/0x158 [c0000000fe08bb30] [c00000000035b9f4] .__platform_driver_register+0x6c/0x80 [c0000000fe08bba0] [c00000000084e080] .of_flash_driver_init+0x1c/0x30 [c0000000fe08bc10] [c000000000001864] .do_one_initcall+0xbc/0x238 [c0000000fe08bd00] [c00000000082cdc0] .kernel_init_freeable+0x188/0x268 [c0000000fe08bdb0] [c0000000000020a0] .kernel_init+0x1c/0xf7c [c0000000fe08be30] [c000000000000884] .ret_from_kernel_thread+0x58/0xd4 Instruction dump: 41bd0010 480000c8 4bf04eb5 60000000 e94d0028 e93f0000 7cc95214 e8a60008 7fc9502a 2fbe0000 419e00c8 e93f0022 <7f7e482a> 39200000 88ed06b2 992d06b2 ---[ end trace b4c9a94804a42d40 ]--- It seems that the corrupted partition header on my mtd device triggers a bug in the ftl. In function build_maps() it will allocate the buffers needed by the mtd partition, but if something goes wrong such as kmalloc failure, mtd read error or invalid partition header parameter, it will free all allocated buffers and then return non-zero. In my case, it seems that partition header parameter 'NumTransferUnits' is invalid. And the ftl_freepart() is a function which free all the partition buffers allocated by build_maps(). Given the build_maps() is a self cleaning function, so there is no need to invoke this function even if build_maps() return with error. Otherwise it will causes the buffers to be freed twice and then weird things would happen. Signed-off-by: Kevin Hao <haokexin@xxxxxxxxx> Signed-off-by: Brian Norris <computersforpeace@xxxxxxxxx> Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> --- drivers/mtd/ftl.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/mtd/ftl.c b/drivers/mtd/ftl.c index 19d637266fcd..71e4f6ccae2f 100644 --- a/drivers/mtd/ftl.c +++ b/drivers/mtd/ftl.c @@ -1075,7 +1075,6 @@ static void ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) return; } - ftl_freepart(partition); kfree(partition); } -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html