[PATCH 3/3] net: tftp: Fix load_block offset calculation
Ley Foon Tan
ley.foon.tan at intel.com
Tue Aug 25 04:26:37 CEST 2020
When load the last block, the "len" might not be a block size. This cause
loading the incorrect last block data.
The fix change "len" to tftp_block_size and minus one tftp_block_size
for offset calculation.
Use same offset calculation formula as in store_block().
Signed-off-by: Ley Foon Tan <ley.foon.tan at intel.com>
---
net/tftp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/tftp.c b/net/tftp.c
index 6e68a427d4cf..292e7b4cddcf 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -218,7 +218,8 @@ static void new_transfer(void)
static int load_block(unsigned block, uchar *dst, unsigned len)
{
/* We may want to get the final block from the previous set */
- ulong offset = ((int)block - 1) * len + tftp_block_wrap_offset;
+ ulong offset = block * tftp_block_size + tftp_block_wrap_offset -
+ tftp_block_size;
ulong tosend = len;
tosend = min(net_boot_file_size - offset, tosend);
--
2.19.0
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