From 9e5fad0f792539ae4258bc116bf408bb6faf7e82 Mon Sep 17 00:00:00 2001 From: Nicolas Belin Date: Tue, 17 Dec 2024 14:29:10 +0100 Subject: [PATCH] boot: android: rework bootargs concatenation Rework the bootargs concatenation allocating more accurately the length that is needed. Do not forget an extra byte for the null termination byte as, in some cases, the allocation was 1 byte short. Fixes: 86f4695b ("image: Fix Android boot image support") Signed-off-by: Nicolas Belin Reviewed-by: Mattijs Korpershoek Link: https://lore.kernel.org/r/20241217-fix-bootargs-concatenation-v2-3-b2fd7cf4e130@baylibre.com Signed-off-by: Mattijs Korpershoek --- boot/image-android.c | 29 ++++++++++++++++------------- 1 file changed, 16 insertions(+), 13 deletions(-) diff --git a/boot/image-android.c b/boot/image-android.c index 362a5c7435..61ac312db7 100644 --- a/boot/image-android.c +++ b/boot/image-android.c @@ -287,37 +287,40 @@ int android_image_get_kernel(const void *hdr, kernel_addr, DIV_ROUND_UP(img_data.kernel_size, 1024)); int len = 0; + char *bootargs = env_get("bootargs"); + + if (bootargs) + len += strlen(bootargs); + if (*img_data.kcmdline) { printf("Kernel command line: %s\n", img_data.kcmdline); - len += strlen(img_data.kcmdline); + len += strlen(img_data.kcmdline) + (len ? 1 : 0); /* +1 for extra space */ } if (*img_data.kcmdline_extra) { printf("Kernel extra command line: %s\n", img_data.kcmdline_extra); - len += strlen(img_data.kcmdline_extra); + len += strlen(img_data.kcmdline_extra) + (len ? 1 : 0); /* +1 for extra space */ } - char *bootargs = env_get("bootargs"); - if (bootargs) - len += strlen(bootargs); - - char *newbootargs = malloc(len + 2); + char *newbootargs = malloc(len + 1); /* +1 for the '\0' */ if (!newbootargs) { puts("Error: malloc in android_image_get_kernel failed!\n"); return -ENOMEM; } - *newbootargs = '\0'; + *newbootargs = '\0'; /* set to Null in case no components below are present */ - if (bootargs) { + if (bootargs) strcpy(newbootargs, bootargs); - strcat(newbootargs, " "); - } - if (*img_data.kcmdline) + if (*img_data.kcmdline) { + if (*newbootargs) /* If there is something in newbootargs, a space is needed */ + strcat(newbootargs, " "); strcat(newbootargs, img_data.kcmdline); + } if (*img_data.kcmdline_extra) { - strcat(newbootargs, " "); + if (*newbootargs) /* If there is something in newbootargs, a space is needed */ + strcat(newbootargs, " "); strcat(newbootargs, img_data.kcmdline_extra); } -- 2.39.5