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spl: ymodem: Fix buffer overflow during Image copy

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ymodem_read_fit() driver will end copying up to BUF_SIZE boundary even
when requested size of copy operation is less than that.
For example, if offset = 0, size = 1440B, ymodem_read_fit() ends up
copying 2KB from offset = 0, to destination buffer addr

This causes data corruption when malloc'd buffer is passed during UART
boot since commit 03f1f78a9b ("spl: fit: Prefer a malloc()'d buffer
for loading images")

With this, UART boot works again on K3 (AM654, J7, AM64) family of
devices.

Fixes: 03f1f78a9b ("spl: fit: Prefer a malloc()'d buffer for loading images")
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
This commit is contained in:
Vignesh Raghavendra 2022-01-31 09:49:19 +05:30 • committed by Tom Rini
parent cd59d44cfd
commit c1335e2ca5
1 changed files with 14 additions and 1 deletions
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15
common/spl/spl_ymodem.c
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@ -42,6 +42,7 @@ static ulong ymodem_read_fit(struct spl_load_info *load, ulong offset,
int res, err, buf_offset;
struct ymodem_fit_info *info = load->priv;
char *buf = info->buf;
ulong copy_size = size;
while (info->image_read < offset) {
res = xyzModem_stream_read(buf, BUF_SIZE, &err);
@ -57,8 +58,14 @@ static ulong ymodem_read_fit(struct spl_load_info *load, ulong offset,
buf_offset = (info->image_read % BUF_SIZE);
else
buf_offset = BUF_SIZE;
if (res > copy_size) {
memcpy(addr, &buf[buf_offset - res], copy_size);
goto done;
}
memcpy(addr, &buf[buf_offset - res], res);
addr = addr + res;
copy_size -= res;
}
while (info->image_read < offset + size) {
@ -66,11 +73,17 @@ static ulong ymodem_read_fit(struct spl_load_info *load, ulong offset,
if (res <= 0)
break;
memcpy(addr, buf, res);
info->image_read += res;
if (res > copy_size) {
memcpy(addr, buf, copy_size);
goto done;
}
memcpy(addr, buf, res);
addr += res;
copy_size -= res;
}
done:
return size;
}