In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/axis-cgi/call_overlay_upload.cgi line 3:

. /usr/html/axis-cgi/lib/functions.sh

  ^-- SC1091 (info): Not following: /usr/html/axis-cgi/lib/functions.sh was not specified as input (see shellcheck -x).

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/axis-cgi/call_overlay_upload.cgi line 9:

	printf "Invalid parameter: $1\r\n"

               ^-------------------------^ SC2059 (info): Don't use variables in the printf format string. Use printf '..%s..' "$foo".

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/axis-cgi/call_overlay_upload.cgi line 28:

ov_path=$(file_upload -S $CONTENT_LENGTH -n 102400 	--allowed-realms=$REALMS --allowed-dirs=$DIRS) || ret=$?

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

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

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

Did you mean: 

ov_path=$(file_upload -S "$CONTENT_LENGTH" -n 102400 	--allowed-realms="$REALMS" --allowed-dirs="$DIRS") || ret=$?

For more information:

  https://www.shellcheck.net/wiki/SC1091 -- Not following: /usr/html/axis-cgi...

  https://www.shellcheck.net/wiki/SC2059 -- Don't use variables in the printf...

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