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authorPrasad J Pandit <pjp@fedoraproject.org>2016-06-16 00:22:35 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2016-06-16 18:39:05 +0200
commit926cde5f3e4d2504ed161ed0cb771ac7cad6fd11 (patch)
treec246e98c0c0a3262f79e1e78a4d9056db9fce68c /hw
parent7f0b6e114ae4e142e2b3dfc9fac138f4a30edc4f (diff)
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>
Diffstat (limited to 'hw')
-rw-r--r--hw/scsi/esp.c6
1 files changed, 4 insertions, 2 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();