From 27dd5548396e69c4b735739b8d7824ca2a3f39d5 Mon Sep 17 00:00:00 2001 From: Ken Cox Date: Fri, 7 Mar 2014 12:22:22 -0600 Subject: [PATCH] Staging: unisys: uislib: Fix locking in info_proc_read_helper() Make sure BusListLock is unlocked before returning. If an error is encountered early on in info_proc_read_helper() the function can return without unlocking. Also changed the PROCLINE macro so that it doesn't include a goto statement. Reported-by: Dan Carpenter Signed-off-by: Ken Cox Signed-off-by: Greg Kroah-Hartman --- drivers/staging/unisys/uislib/uislib.c | 95 +++++++++++++++----------- 1 file changed, 55 insertions(+), 40 deletions(-) diff --git a/drivers/staging/unisys/uislib/uislib.c b/drivers/staging/unisys/uislib/uislib.c index d77df9a79ae2..b9bf7b4f6cec 100644 --- a/drivers/staging/unisys/uislib/uislib.c +++ b/drivers/staging/unisys/uislib/uislib.c @@ -1622,13 +1622,8 @@ chipset_proc_write(struct file *file, const char __user *buffer, return -EFAULT; } -#define PROCLINE(...) \ - do { \ - if (uisutil_add_proc_line_ex(&tot, buff, \ - buff_len, __VA_ARGS__) < 0) { \ - goto err_done; \ - } \ - } while (0) +#define PLINE(...) uisutil_add_proc_line_ex(&tot, buff, \ + buff_len, __VA_ARGS__) static int info_proc_read_helper(char **buff, int *buff_len) @@ -1636,55 +1631,75 @@ info_proc_read_helper(char **buff, int *buff_len) int i, tot = 0; struct bus_info *bus; - PROCLINE("\nBuses:\n"); + if (PLINE("\nBuses:\n") < 0) + goto err_done; read_lock(&BusListLock); for (bus = BusListHead; bus; bus = bus->next) { - PROCLINE(" bus=0x%p, busNo=%d, deviceCount=%d\n", - bus, bus->busNo, bus->deviceCount); + if (PLINE(" bus=0x%p, busNo=%d, deviceCount=%d\n", + bus, bus->busNo, bus->deviceCount) < 0) + goto err_done_unlock; - PROCLINE(" Devices:\n"); + + if (PLINE(" Devices:\n") < 0) + goto err_done_unlock; for (i = 0; i < bus->deviceCount; i++) { if (bus->device[i]) { - PROCLINE(" busNo %d, device[%i]: 0x%p, chanptr=0x%p, swtch=0x%p\n", - bus->busNo, i, bus->device[i], - bus->device[i]->chanptr, - bus->device[i]->swtch); - PROCLINE(" first_busy_cnt=%llu, moved_to_tail_cnt=%llu, last_on_list_cnt=%llu\n", - bus->device[i]->first_busy_cnt, - bus->device[i]->moved_to_tail_cnt, - bus->device[i]->last_on_list_cnt); + if (PLINE(" busNo %d, device[%i]: 0x%p, chanptr=0x%p, swtch=0x%p\n", + bus->busNo, i, bus->device[i], + bus->device[i]->chanptr, + bus->device[i]->swtch) < 0) + goto err_done_unlock; + + if (PLINE(" first_busy_cnt=%llu, moved_to_tail_cnt=%llu, last_on_list_cnt=%llu\n", + bus->device[i]->first_busy_cnt, + bus->device[i]->moved_to_tail_cnt, + bus->device[i]->last_on_list_cnt) < 0) + goto err_done_unlock; } } } read_unlock(&BusListLock); - PROCLINE("Malloc bytes in use: %d\n", atomic_read(&Malloc_BytesInUse)); - PROCLINE("Malloc buffers in use: %d\n", - atomic_read(&Malloc_BuffersInUse)); - PROCLINE("Malloc allocation failures: %d\n", - atomic_read(&Malloc_FailuresAlloc)); - PROCLINE("Malloc free failures: %d\n", - atomic_read(&Malloc_FailuresFree)); - PROCLINE("Malloc total mallocs: %u (may overflow)\n", - (unsigned) atomic_read(&Malloc_TotalMallocs)); - PROCLINE("Malloc total frees: %u (may overflow)\n", - (unsigned) atomic_read(&Malloc_TotalFrees)); - PROCLINE("UisUtils_Registered_Services: %d\n", - atomic_read(&UisUtils_Registered_Services)); - - PROCLINE("cycles_before_wait %llu wait_cycles:%llu\n", - cycles_before_wait, wait_cycles); - PROCLINE("tot_wakeup_cnt %llu:tot_wait_cnt %llu:tot_schedule_cnt %llu\n", - tot_wakeup_cnt, tot_wait_cnt, tot_schedule_cnt); - PROCLINE("en_smart_wakeup %d\n", en_smart_wakeup); - PROCLINE("tot_moved_to_tail_cnt %llu\n", tot_moved_to_tail_cnt); + if (PLINE("Malloc bytes in use: %d\n", + atomic_read(&Malloc_BytesInUse)) < 0) + goto err_done; + if (PLINE("Malloc buffers in use: %d\n", + atomic_read(&Malloc_BuffersInUse)) < 0) + goto err_done; + if (PLINE("Malloc allocation failures: %d\n", + atomic_read(&Malloc_FailuresAlloc)) < 0) + goto err_done; + if (PLINE("Malloc free failures: %d\n", + atomic_read(&Malloc_FailuresFree)) < 0) + goto err_done; + if (PLINE("Malloc total mallocs: %u (may overflow)\n", + (unsigned) atomic_read(&Malloc_TotalMallocs)) < 0) + goto err_done; + if (PLINE("Malloc total frees: %u (may overflow)\n", + (unsigned) atomic_read(&Malloc_TotalFrees)) < 0) + goto err_done; + if (PLINE("UisUtils_Registered_Services: %d\n", + atomic_read(&UisUtils_Registered_Services)) < 0) + goto err_done; + if (PLINE("cycles_before_wait %llu wait_cycles:%llu\n", + cycles_before_wait, wait_cycles) < 0) + goto err_done; + if (PLINE("tot_wakeup_cnt %llu:tot_wait_cnt %llu:tot_schedule_cnt %llu\n", + tot_wakeup_cnt, tot_wait_cnt, tot_schedule_cnt) < 0) + goto err_done; + if (PLINE("en_smart_wakeup %d\n", en_smart_wakeup) < 0) + goto err_done; + if (PLINE("tot_moved_to_tail_cnt %llu\n", tot_moved_to_tail_cnt) < 0) + goto err_done; return tot; -err_done: +err_done_unlock: + read_unlock(&BusListLock); +err_done: return -1; } -- 2.34.1