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f2fs: Use scnprintf() for avoiding potential buffer overflow

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Since snprintf() returns the would-be-output size instead of the
actual output size, the succeeding calls may go beyond the given
buffer limit.  Fix it by replacing with scnprintf().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Takashi Iwai 2020-03-11 10:33:53 +01:00 committed by Jaegeuk Kim
parent 2536ac6872
commit c6d5789bea
1 changed files with 19 additions and 19 deletions
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38
fs/f2fs/sysfs.c
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@ -109,47 +109,47 @@ static ssize_t features_show(struct f2fs_attr *a,
return sprintf(buf, "0\n");
if (f2fs_sb_has_encrypt(sbi))
len += snprintf(buf, PAGE_SIZE - len, "%s",
len += scnprintf(buf, PAGE_SIZE - len, "%s",
"encryption");
if (f2fs_sb_has_blkzoned(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "blkzoned");
if (f2fs_sb_has_extra_attr(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "extra_attr");
if (f2fs_sb_has_project_quota(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "projquota");
if (f2fs_sb_has_inode_chksum(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "inode_checksum");
if (f2fs_sb_has_flexible_inline_xattr(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "flexible_inline_xattr");
if (f2fs_sb_has_quota_ino(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "quota_ino");
if (f2fs_sb_has_inode_crtime(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "inode_crtime");
if (f2fs_sb_has_lost_found(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "lost_found");
if (f2fs_sb_has_verity(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "verity");
if (f2fs_sb_has_sb_chksum(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "sb_checksum");
if (f2fs_sb_has_casefold(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "casefold");
if (f2fs_sb_has_compression(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "compression");
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "pin_file");
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
return len;
}
@ -233,16 +233,16 @@ static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
int hot_count = sbi->raw_super->hot_ext_count;
int len = 0, i;
len += snprintf(buf + len, PAGE_SIZE - len,
len += scnprintf(buf + len, PAGE_SIZE - len,
"cold file extension:\n");
for (i = 0; i < cold_count; i++)
len += snprintf(buf + len, PAGE_SIZE - len, "%s\n",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s\n",
extlist[i]);
len += snprintf(buf + len, PAGE_SIZE - len,
len += scnprintf(buf + len, PAGE_SIZE - len,
"hot file extension:\n");
for (i = cold_count; i < cold_count + hot_count; i++)
len += snprintf(buf + len, PAGE_SIZE - len, "%s\n",
len += scnprintf(buf + len, PAGE_SIZE - len, "%s\n",
extlist[i]);
return len;
}