In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/axis-cgi/overlay_set.cgi line 7:

filename=$(echo $* | sed 's/\\//g')

                ^-- SC2048 (warning): Use "$@" (with quotes) to prevent whitespace problems.

                ^-- SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

filename=$(echo "$*" | sed 's/\\//g')

For more information:

  https://www.shellcheck.net/wiki/SC2048 -- Use "$@" (with quotes) to prevent...

  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...