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When returning an error and freeing allocated memory from ucs2_to_utf8

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and utf8_to_ucs2, be sure to NULL out the return pointer too, rather
than return a pointer to free memory.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D13917
This commit is contained in:
Warner Losh 2018-01-15 22:17:15 +00:00
parent 46bf534caf
commit 27d95c1a03
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=328029
1 changed files with 18 additions and 17 deletions
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35
stand/efi/libefi/efichar.c
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@ -116,8 +116,10 @@ ucs2_to_utf8(const efi_char *nm, char **name)
if (len >= sz) {
/* Absent bugs, we'll never return EOVERFLOW */
if (freeit)
if (freeit) {
free(*name);
*name = NULL;
}
return (EOVERFLOW);
}
*cp++ = '\0';
@ -150,11 +152,8 @@ utf8_to_ucs2(const char *name, efi_char **nmp, size_t *len)
*/
if ((c & 0xc0) != 0x80) {
/* Initial characters. */
if (bytes != 0) {
if (freeit)
free(nm);
return (EILSEQ);
}
if (bytes != 0)
goto ilseq;
if ((c & 0xf8) == 0xf0) {
ucs4 = c & 0x07;
bytes = 3;
@ -173,29 +172,31 @@ utf8_to_ucs2(const char *name, efi_char **nmp, size_t *len)
if (bytes > 0) {
ucs4 = (ucs4 << 6) + (c & 0x3f);
bytes--;
} else if (bytes == 0) {
if (freeit)
free(nm);
return (EILSEQ);
}
} else if (bytes == 0)
goto ilseq;
}
if (bytes == 0) {
if (ucs4 > 0xffff) {
if (freeit)
free(nm);
return (EILSEQ);
}
if (ucs4 > 0xffff)
goto ilseq;
*nm++ = (efi_char)ucs4;
sz -= 2;
}
}
if (sz < 2) {
if (freeit)
if (freeit) {
free(nm);
*nmp = NULL;
}
return (EDOOFUS);
}
sz -= 2;
*nm = 0;
*len -= sz;
return (0);
ilseq:
if (freeit) {
free(nm);
*nmp = NULL;
}
return (EILSEQ);
}