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fs: fat: must not write directory '.' and '..'

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Directories or files called '.' or '..' cannot be created or written to
in any directory. Move the test to normalize_longname() to check this
early.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2021-01-30 11:08:21 +01:00
parent 4c4006b694
commit 0be286cd6d
1 changed files with 3 additions and 10 deletions
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13
fs/fat/fat_write.c
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@ -1259,8 +1259,10 @@ again:
static int normalize_longname(char *l_filename, const char *filename) static int normalize_longname(char *l_filename, const char *filename)
{ {
const char *p, illegal[] = "<>:\"/\\|?*"; const char *p, illegal[] = "<>:\"/\\|?*";
size_t len;
if (strlen(filename) >= VFAT_MAXLEN_BYTES) len = strlen(filename);
if (!len || len >= VFAT_MAXLEN_BYTES || filename[len - 1] == '.')
return -1; return -1;
for (p = filename; *p; ++p) { for (p = filename; *p; ++p) {
@ -1348,15 +1350,6 @@ int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
char shortname[SHORT_NAME_SIZE]; char shortname[SHORT_NAME_SIZE];
int ndent; int ndent;
if (itr->is_root) {
/* root dir cannot have "." or ".." */
if (!strcmp(l_filename, ".") ||
!strcmp(l_filename, "..")) {
ret = -EINVAL;
goto exit;
}
}
if (pos) { if (pos) {
/* No hole allowed */ /* No hole allowed */
ret = -EINVAL; ret = -EINVAL;