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Prevent index overflow due to tag_map in libwc

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Bug-Chromium: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31936
This commit is contained in:
Tatsuya Kinoshita
2021-03-11 19:34:53 +09:00
parent 7c8595f66b
commit 2341cef6e9
2 changed files with 5 additions and 5 deletions
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6
libwc/ucs.c
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@@ -677,9 +677,9 @@ wc_ucs_put_tag(char *p)
if (!strcasecmp(p, tag_map[i]))
return i;
}
n_tag_map++;
if (n_tag_map == MAX_TAG_MAP)
if (n_tag_map + 1 >= MAX_TAG_MAP)
return 0;
n_tag_map++;
tag_map[n_tag_map] = p;
return n_tag_map;
}
@@ -687,7 +687,7 @@ wc_ucs_put_tag(char *p)
char *
wc_ucs_get_tag(int ntag)
{
if (ntag == 0 || ntag > n_tag_map)
if (ntag <= 0 || ntag > n_tag_map)
return NULL;
return tag_map[ntag];
}

4
libwc/ucs.h
View File

@@ -25,8 +25,8 @@
#define WC_C_UCS4_PLANE3 0x30000
#define wc_ucs_tag_to_ucs(c) ((c) & WC_C_UNICODE_MASK)
#define wc_ucs_tag_to_tag(c) ((c) >> 24)
#define wc_ucs_to_ucs_tag(c,tag) ((c) | ((tag) << 24))
#define wc_ucs_tag_to_tag(c) (((c) >> 24) & 0xff)
#define wc_ucs_to_ucs_tag(c,tag) ((c) | ((wc_uint32)((tag) & 0xff) << 24))
#define wc_ccs_ucs_to_ccs_ucs_tag(ccs) (WC_CCS_UCS_TAG | ((ccs) & ~WC_CCS_A_SET))
#define wc_ucs_to_utf16(ucs) \
((((((ucs) - WC_C_UCS4_PLANE1) >> 10) | WC_C_UCS2_SURROGATE) << 16) \