From 146afeb235ccec10c17ad8ea26327c0c79dbd968 Mon Sep 17 00:00:00 2001 From: Xu Panda <xu.panda@zte.com.cn> Date: Sat, 3 Dec 2022 14:22:58 +0800 Subject: [PATCH] block: use strscpy() to instead of strncpy() The implementation of strscpy() is more robust and safer. That's now the recommended way to copy NUL terminated strings. Signed-off-by: Xu Panda <xu.panda@zte.com.cn> Signed-off-by: Yang Yang <yang.yang29@zte.com> Reviewed-by: Justin Stitt <justinstitt@google.com> Link: https://lore.kernel.org/r/202212031422587503771@zte.com.cn Signed-off-by: Jens Axboe <axboe@kernel.dk> --- block/partitions/cmdline.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/block/partitions/cmdline.c b/block/partitions/cmdline.c index 1af610f0ba8c6..c03bc105e5753 100644 --- a/block/partitions/cmdline.c +++ b/block/partitions/cmdline.c @@ -81,8 +81,7 @@ static int parse_subpart(struct cmdline_subpart **subpart, char *partdef) length = min_t(int, next - partdef, sizeof(new_subpart->name) - 1); - strncpy(new_subpart->name, partdef, length); - new_subpart->name[length] = '\0'; + strscpy(new_subpart->name, partdef, length); partdef = ++next; } else @@ -140,8 +139,7 @@ static int parse_parts(struct cmdline_parts **parts, const char *bdevdef) } length = min_t(int, next - bdevdef, sizeof(newparts->name) - 1); - strncpy(newparts->name, bdevdef, length); - newparts->name[length] = '\0'; + strscpy(newparts->name, bdevdef, length); newparts->nr_subparts = 0; next_subpart = &newparts->subpart; @@ -153,8 +151,7 @@ static int parse_parts(struct cmdline_parts **parts, const char *bdevdef) length = (!next) ? (sizeof(buf) - 1) : min_t(int, next - bdevdef, sizeof(buf) - 1); - strncpy(buf, bdevdef, length); - buf[length] = '\0'; + strscpy(buf, bdevdef, length); ret = parse_subpart(next_subpart, buf); if (ret) @@ -267,8 +264,7 @@ static int add_part(int slot, struct cmdline_subpart *subpart, label_min = min_t(int, sizeof(info->volname) - 1, sizeof(subpart->name)); - strncpy(info->volname, subpart->name, label_min); - info->volname[label_min] = '\0'; + strscpy(info->volname, subpart->name, label_min); snprintf(tmp, sizeof(tmp), "(%s)", info->volname); strlcat(state->pp_buf, tmp, PAGE_SIZE); -- GitLab