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| author | Michael Brown | 2018-03-18 16:43:11 +0100 |
|---|---|---|
| committer | Michael Brown | 2018-03-18 16:43:11 +0100 |
| commit | b11ae1d91b32c7d0d52a0fc35a37b5e2f57a0f79 (patch) | |
| tree | d055dbb9adbc68f35645bfa4d5c1c01fe8600825 /src | |
| parent | [lacp] Fix debug message to match documentation (diff) | |
| download | ipxe-b11ae1d91b32c7d0d52a0fc35a37b5e2f57a0f79.tar.gz ipxe-b11ae1d91b32c7d0d52a0fc35a37b5e2f57a0f79.tar.xz ipxe-b11ae1d91b32c7d0d52a0fc35a37b5e2f57a0f79.zip | |
[tftp] Prevent potential division by zero
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/net/udp/tftp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/net/udp/tftp.c b/src/net/udp/tftp.c index 4255472e..6ce27497 100644 --- a/src/net/udp/tftp.c +++ b/src/net/udp/tftp.c @@ -279,6 +279,8 @@ static int tftp_presize ( struct tftp_request *tftp, size_t filesize ) { * length is an exact multiple of the blocksize will have a * trailing zero-length block, which must be included. */ + if ( tftp->blksize == 0 ) + return -EINVAL; num_blocks = ( ( filesize / tftp->blksize ) + 1 ); if ( ( rc = bitmap_resize ( &tftp->bitmap, num_blocks ) ) != 0 ) { DBGC ( tftp, "TFTP %p could not resize bitmap to %d blocks: " |