diff options
| author | Stephen Checkoway <stephen.checkoway@oberlin.edu> | 2019-02-19 10:37:27 -0500 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2019-03-06 10:37:23 +0100 |
| commit | d80cf1eb2e87df3a9bfb226bcc7fb3a1aa858817 (patch) | |
| tree | 6b059a4fc081834da97ba72aac30330d8c274321 /hw | |
| parent | 7d9b68acb37059bee347ce7e4c783ca5b7cf7ae0 (diff) | |
block/pflash_cfi02: Fix memory leak and potential use-after-free
Don't dynamically allocate the pflash's timer. But do use timer_del in
an unrealize function to make sure that the timer can't fire after the
pflash_t has been freed.
Signed-off-by: Stephen Checkoway <stephen.checkoway@oberlin.edu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190219153727.62279-1-stephen.checkoway@oberlin.edu>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/block/pflash_cfi02.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/hw/block/pflash_cfi02.c b/hw/block/pflash_cfi02.c index 0f8b7b8c7b..1588aeff5a 100644 --- a/hw/block/pflash_cfi02.c +++ b/hw/block/pflash_cfi02.c @@ -84,7 +84,7 @@ struct pflash_t { uint16_t unlock_addr0; uint16_t unlock_addr1; uint8_t cfi_table[0x52]; - QEMUTimer *timer; + QEMUTimer timer; /* The device replicates the flash memory across its memory space. Emulate * that by having a container (.mem) filled with an array of aliases * (.mem_mappings) pointing to the flash memory (.orig_mem). @@ -429,7 +429,7 @@ static void pflash_write (pflash_t *pfl, hwaddr offset, } pfl->status = 0x00; /* Let's wait 5 seconds before chip erase is done */ - timer_mod(pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + + timer_mod(&pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + (NANOSECONDS_PER_SECOND * 5)); break; case 0x30: @@ -444,7 +444,7 @@ static void pflash_write (pflash_t *pfl, hwaddr offset, } pfl->status = 0x00; /* Let's wait 1/2 second before sector erase is done */ - timer_mod(pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + + timer_mod(&pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + (NANOSECONDS_PER_SECOND / 2)); break; default: @@ -596,7 +596,7 @@ static void pflash_cfi02_realize(DeviceState *dev, Error **errp) pfl->rom_mode = 1; sysbus_init_mmio(SYS_BUS_DEVICE(dev), &pfl->mem); - pfl->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, pflash_timer, pfl); + timer_init_ns(&pfl->timer, QEMU_CLOCK_VIRTUAL, pflash_timer, pfl); pfl->wcycle = 0; pfl->cmd = 0; pfl->status = 0; @@ -695,11 +695,18 @@ static Property pflash_cfi02_properties[] = { DEFINE_PROP_END_OF_LIST(), }; +static void pflash_cfi02_unrealize(DeviceState *dev, Error **errp) +{ + pflash_t *pfl = CFI_PFLASH02(dev); + timer_del(&pfl->timer); +} + static void pflash_cfi02_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); dc->realize = pflash_cfi02_realize; + dc->unrealize = pflash_cfi02_unrealize; dc->props = pflash_cfi02_properties; set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); } |