diff options
| author | Prasad J Pandit <pjp@fedoraproject.org> | 2016-06-16 00:22:35 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-06-16 18:39:05 +0200 |
| commit | 926cde5f3e4d2504ed161ed0cb771ac7cad6fd11 (patch) | |
| tree | c246e98c0c0a3262f79e1e78a4d9056db9fce68c | |
| parent | 7f0b6e114ae4e142e2b3dfc9fac138f4a30edc4f (diff) | |
| download | qemu-926cde5f3e4d2504ed161ed0cb771ac7cad6fd11.zip | |
scsi: esp: make cmdbuf big enough for maximum CDB size
While doing DMA read into ESP command buffer 's->cmdbuf', it could
write past the 's->cmdbuf' area, if it was transferring more than 16
bytes. Increase the command buffer size to 32, which is maximum when
's->do_cmd' is set, and add a check on 'len' to avoid OOB access.
Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | hw/scsi/esp.c | 6 | ||||
| -rw-r--r-- | include/hw/scsi/esp.h | 3 |
2 files changed, 6 insertions, 3 deletions
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 64680b3809..baa0a2cfdf 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -248,6 +248,8 @@ static void esp_do_dma(ESPState *s) len = s->dma_left; if (s->do_cmd) { trace_esp_do_dma(s->cmdlen, len); + assert (s->cmdlen <= sizeof(s->cmdbuf) && + len <= sizeof(s->cmdbuf) - s->cmdlen); s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len); return; } @@ -345,7 +347,7 @@ static void handle_ti(ESPState *s) s->dma_counter = dmalen; if (s->do_cmd) - minlen = (dmalen < 32) ? dmalen : 32; + minlen = (dmalen < ESP_CMDBUF_SZ) ? dmalen : ESP_CMDBUF_SZ; else if (s->ti_size < 0) minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size; else @@ -449,7 +451,7 @@ void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val) break; case ESP_FIFO: if (s->do_cmd) { - if (s->cmdlen < TI_BUFSZ) { + if (s->cmdlen < ESP_CMDBUF_SZ) { s->cmdbuf[s->cmdlen++] = val & 0xff; } else { trace_esp_error_fifo_overrun(); diff --git a/include/hw/scsi/esp.h b/include/hw/scsi/esp.h index 6c795276c9..d2c48869e1 100644 --- a/include/hw/scsi/esp.h +++ b/include/hw/scsi/esp.h @@ -14,6 +14,7 @@ void esp_init(hwaddr espaddr, int it_shift, #define ESP_REGS 16 #define TI_BUFSZ 16 +#define ESP_CMDBUF_SZ 32 typedef struct ESPState ESPState; @@ -31,7 +32,7 @@ struct ESPState { SCSIBus bus; SCSIDevice *current_dev; SCSIRequest *current_req; - uint8_t cmdbuf[TI_BUFSZ]; + uint8_t cmdbuf[ESP_CMDBUF_SZ]; uint32_t cmdlen; uint32_t do_cmd; |