From: Patrick McHardy Date: Thu, 23 Mar 2006 10:59:24 +0000 (-0800) Subject: [PATCH] cciss: fix use-after-free in cciss_init_one X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=61808c2bbba127ecd9786401c55ea4c394aa0240;p=linux-beck.git [PATCH] cciss: fix use-after-free in cciss_init_one free_hba() sets hba[i] to NULL, the dereference afterwards results in this crash. Setting busy_initializing to 0 actually looks unnecessary, but I'm not entirely sure, which is why I left it in. cciss: controller appears to be disabled Unable to handle kernel NULL pointer dereference at virtual address 00000370 printing eip: c1114d53 *pde = 00000000 Oops: 0002 [#1] Modules linked in: CPU: 0 EIP: 0060:[] Not tainted VLI EFLAGS: 00010286 (2.6.16 #1) EIP is at cciss_init_one+0x4e9/0x4fe eax: 00000000 ebx: c132cd60 ecx: c13154e4 edx: c27d3c00 esi: 00000000 edi: c2748800 ebp: c2536ee4 esp: c2536eb8 ds: 007b es: 007b ss: 0068 Process swapper (pid: 1, threadinfo=c2536000 task=c2535a30) Stack: <0>00000000 00000000 00000000 c13fdba0 c2536ee8 c13159c0 c2536f38 f7c74740 c132cd60 c132cd60 ffffffed c2536ef0 c10c1d51 c2748800 c2536f04 c10c1d85 c132cd60 c2748800 c132cd8c c2536f14 c10c1db8 c2748848 00000000 c2536f28 Call Trace: [] show_stack_log_lvl+0xa8/0xb0 [] show_registers+0x102/0x16a [] die+0xc1/0x13c [] do_page_fault+0x38a/0x525 [] error_code+0x4f/0x54 [] pci_call_probe+0xd/0x10 [] __pci_device_probe+0x31/0x43 [] pci_device_probe+0x21/0x34 [] driver_probe_device+0x44/0x99 [] __driver_attach+0x39/0x5d [] bus_for_each_dev+0x35/0x5a [] driver_attach+0x14/0x16 [] bus_add_driver+0x5c/0x8f [] driver_register+0x73/0x78 [] __pci_register_driver+0x5f/0x71 [] cciss_init+0x1a/0x1c [] do_initcalls+0x4c/0x96 [] do_basic_setup+0x1c/0x1e [] init+0x35/0x118 [] kernel_thread_helper+0x5/0xb Code: 04 b5 e0 de 40 c1 8d 50 04 8b 40 34 e8 3f b7 f9 ff 8b 04 b5 e0 de 40 c1 e8 aa f3 ff ff 89 f0 e8 e8 fa ff ff 8b 04 b5 e0 de 40 c1 80 70 03 00 00 00 00 00 00 83 c8 ff 8d 65 f4 5b 5e 5f 5d c3 <0>Kernel panic - not syncing: Attempted to kill init! Signed-off-by: Patrick McHardy Cc: Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index cf39cf9aac25..e29b8926f80e 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -3268,8 +3268,8 @@ clean2: unregister_blkdev(hba[i]->major, hba[i]->devname); clean1: release_io_mem(hba[i]); - free_hba(i); hba[i]->busy_initializing = 0; + free_hba(i); return(-1); }