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replay: Exit on errors reading from replay log

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Currently replay_get_byte() does not check for an error
from getc(). Coverity points out (CID 1390622) that this
could result in unexpected behaviour (such as looping
forever, if we use the replay_get_dword() return value
for a loop count). We don't expect reads from the replay
log to fail, and if they do there is no way we can
continue. So make them fatal errors.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-id: 20181106153330.5139-1-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-11-06 15:33:30 +00:00
parent fa27257432
commit 0b57007755
1 changed files with 13 additions and 3 deletions
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16
replay/replay-internal.c
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@ -35,6 +35,12 @@ static void replay_write_error(void)
}
}
static void replay_read_error(void)
{
error_report("error reading the replay data");
exit(1);
}
void replay_put_byte(uint8_t byte)
{
if (replay_file) {
@ -83,7 +89,11 @@ uint8_t replay_get_byte(void)
{
uint8_t byte = 0;
if (replay_file) {
byte = getc(replay_file);
int r = getc(replay_file);
if (r == EOF) {
replay_read_error();
}
byte = r;
}
return byte;
}
@ -126,7 +136,7 @@ void replay_get_array(uint8_t *buf, size_t *size)
if (replay_file) {
*size = replay_get_dword();
if (fread(buf, 1, *size, replay_file) != *size) {
error_report("replay read error");
replay_read_error();
}
}
}
@ -137,7 +147,7 @@ void replay_get_array_alloc(uint8_t **buf, size_t *size)
*size = replay_get_dword();
*buf = g_malloc(*size);
if (fread(*buf, 1, *size, replay_file) != *size) {
error_report("replay read error");
replay_read_error();
}
}
}