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Btrfs: avoid buffer overrun in btrfs_printk
The buffer read-overrun would be triggered by a printk format starting with <N>, where N is a single digit. NUL-terminate after strncpy. Use memcpy, not strncpy, since we know the string we're copying fits in the destination buffer and contains no NUL byte. Signed-off-by: Jim Meyering <meyering@redhat.com>
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1 changed files with 2 additions and 1 deletions
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@ -188,7 +188,8 @@ void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...)
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va_start(args, fmt);
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if (fmt[0] == '<' && isdigit(fmt[1]) && fmt[2] == '>') {
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strncpy(lvl, fmt, 3);
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memcpy(lvl, fmt, 3);
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lvl[3] = '\0';
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fmt += 3;
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type = logtypes[fmt[1] - '0'];
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} else
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