From 59ee8f83b6e77550d5697fced4899e9b5173981f Mon Sep 17 00:00:00 2001 From: Tom Rini Date: Wed, 11 Oct 2017 15:34:33 -0400 Subject: [PATCH] cmd/pxe.c: Rework bootargs construction to clarify string checks As the code currently stands, we first check that the length of the given command line, along with ip_str/mac_str along with an additional 1 for the NULL termination will fit within the buffer we have, and if not, we return an error. The way this code was originally written however left Coverity "unhappy" due to using strcat rather than strncat. Switching this to strncat however causes clang to be unhappy that we aren't enforcing the "1" portion within strncat. Rather than further re-work the code to include a "- 1" in this case as well, make the strcat code only be done within the else side of the length test. This keeps both clang and Coverity happy. Fixes: 48ee0a87bc46 ("cmd/pxe.c: Rework initrd and bootargs handling slightly") Signed-off-by: Tom Rini --- cmd/pxe.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/cmd/pxe.c b/cmd/pxe.c index a62cbe1..7043ad1 100644 --- a/cmd/pxe.c +++ b/cmd/pxe.c @@ -686,16 +686,17 @@ static int label_boot(cmd_tbl_t *cmdtp, struct pxe_label *label) strlen(ip_str), strlen(mac_str), sizeof(bootargs)); return 1; + } else { + if (label->append) + strncpy(bootargs, label->append, + sizeof(bootargs)); + strcat(bootargs, ip_str); + strcat(bootargs, mac_str); + + cli_simple_process_macros(bootargs, finalbootargs); + env_set("bootargs", finalbootargs); + printf("append: %s\n", finalbootargs); } - - if (label->append) - strncpy(bootargs, label->append, sizeof(bootargs)); - strncat(bootargs, ip_str, sizeof(bootargs) - strlen(bootargs)); - strncat(bootargs, mac_str, sizeof(bootargs) - strlen(bootargs)); - - cli_simple_process_macros(bootargs, finalbootargs); - env_set("bootargs", finalbootargs); - printf("append: %s\n", finalbootargs); } bootm_argv[1] = env_get("kernel_addr_r");