Messages in this thread Patch in this message | | | Date | Sat, 15 Oct 2005 23:29:12 +0200 | Subject | uinput crash and fix | From | emard@softhome ... |
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HI
During some begginer's fiddling with uinput it wasn't too difficult to obtain a hard kernel freeze:
CPU: 1 EIP: 0060:[<f90310ff>] Tainted: P VLI EFLAGS: 00210246 (2.6.13.4) EIP is at uinput_request_done+0x14/0x3e [uinput] eax: e2d72000 ebx: e2d73ea4 ecx: ea9e7020 edx: c17efa80 esi: dcbf8400 edi: 400c55cb ebp: dcbf8400 esp: c47bdee0 ds: 007b es: 007b ss: 0068 Process ifeel (pid: 10855, threadinfo=c47bc000 task=dcb2e520) Stack: c4b45980 b7f3c3b4 f9031db7 dcbf8400 e2d73ea4 0000000c 00000001 00000000 00000000 00000003 00200002 da41e00c 00200202 00000021 00200002 c02ed08d 00000000 d9bcabec 00200202 c02edf2f da41e00c 00000002 00000000 00000000 Call Trace: [<f9031db7>] uinput_ioctl+0x2fa/0x49b [uinput] [<c02ed08d>] tty_ldisc_deref+0x48/0x71 [<c02edf2f>] tty_write+0x1cc/0x21e [<c0170688>] do_ioctl+0x78/0x81 [<c0170813>] vfs_ioctl+0x5a/0x1f1 [<c01709e6>] sys_ioctl+0x3c/0x5a [<c0102e39>] syscall_call+0x7/0xb Code: 8b 54 24 08 31 c0 83 fa 0f 77 0b 8b 44 24 04 8b 84 90 1c 01 00 00 c3 56 53 8b 74 24 0c 8b 5c 24 10 8d 43 0c e8 26 a7 0e c7 8b 03 <c7> 84 86 1c 01 00 00 00 00 00 00 8d 86 5c 01 00 00 c7 44 24 0c
and I think this patch fixes this:
--- linux-2.6.13.4/drivers/input/misc/uinput.c.orig 2005-10-15 10:09:38.000000000 +0200 +++ linux-2.6.13.4/drivers/input/misc/uinput.c 2005-10-15 10:19:54.000000000 +0200 @@ -517,7 +517,11 @@ static int uinput_ioctl(struct inode *in break; } req = uinput_request_find(udev, ff_up.request_id); - if (!(req && req->code == UI_FF_UPLOAD && req->u.effect)) { + if (!req) { + retval = -EINVAL; + break; + } + if (!(req->code == UI_FF_UPLOAD && req->u.effect)) { retval = -EINVAL; break; } @@ -535,7 +539,11 @@ static int uinput_ioctl(struct inode *in break; } req = uinput_request_find(udev, ff_erase.request_id); - if (!(req && req->code == UI_FF_ERASE)) { + if (!req) { + retval = -EINVAL; + break; + } + if (!(req->code == UI_FF_ERASE)) { retval = -EINVAL; break; } @@ -553,7 +561,11 @@ static int uinput_ioctl(struct inode *in break; } req = uinput_request_find(udev, ff_up.request_id); - if (!(req && req->code == UI_FF_UPLOAD && req->u.effect)) { + if (!req) { + retval = -EINVAL; + break; + } + if (!(req->code == UI_FF_UPLOAD && req->u.effect)) { retval = -EINVAL; break; } @@ -568,7 +580,11 @@ static int uinput_ioctl(struct inode *in break; } req = uinput_request_find(udev, ff_erase.request_id); - if (!(req && req->code == UI_FF_ERASE)) { + if (!req) { + retval = -EINVAL; + break; + } + if (!(req->code == UI_FF_ERASE)) { retval = -EINVAL; break; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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