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diff -urp file-5.33.orig/src/softmagic.c file-5.33/src/softmagic.c
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--- file-5.33.orig/src/softmagic.c 2020-12-14 12:26:50.286849841 -0500
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+++ file-5.33/src/softmagic.c 2020-12-14 12:35:52.679166211 -0500
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@@ -1748,7 +1748,8 @@ mget(struct magic_set *ms, struct magic
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}
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private uint64_t
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-file_strncmp(const char *s1, const char *s2, size_t len, uint32_t flags)
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+file_strncmp(const char *s1, const char *s2, size_t len, size_t maxlen,
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+ uint32_t flags)
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{
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/*
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* Convert the source args to unsigned here so that (1) the
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@@ -1760,7 +1761,7 @@ file_strncmp(const char *s1, const char
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const unsigned char *b = (const unsigned char *)s2;
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uint32_t ws = flags & (STRING_COMPACT_WHITESPACE |
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STRING_COMPACT_OPTIONAL_WHITESPACE);
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- const unsigned char *eb = b + (ws ? strlen(s2) : len);
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+ const unsigned char *eb = b + (ws ? maxlen : len);
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uint64_t v;
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/*
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@@ -1818,7 +1819,8 @@ file_strncmp(const char *s1, const char
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}
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private uint64_t
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-file_strncmp16(const char *a, const char *b, size_t len, uint32_t flags)
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+file_strncmp16(const char *a, const char *b, size_t len, size_t maxlen,
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+ uint32_t flags)
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{
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/*
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* XXX - The 16-bit string compare probably needs to be done
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@@ -1826,7 +1828,7 @@ file_strncmp16(const char *a, const char
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* At the moment, I am unsure.
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*/
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flags = 0;
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- return file_strncmp(a, b, len, flags);
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+ return file_strncmp(a, b, len, maxlen, flags);
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}
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private int
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@@ -1954,13 +1956,15 @@ magiccheck(struct magic_set *ms, struct
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case FILE_STRING:
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case FILE_PSTRING:
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l = 0;
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- v = file_strncmp(m->value.s, p->s, (size_t)m->vallen, m->str_flags);
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+ v = file_strncmp(m->value.s, p->s, (size_t)m->vallen,
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+ sizeof(p->s), m->str_flags);
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break;
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case FILE_BESTRING16:
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case FILE_LESTRING16:
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l = 0;
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- v = file_strncmp16(m->value.s, p->s, (size_t)m->vallen, m->str_flags);
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+ v = file_strncmp16(m->value.s, p->s, (size_t)m->vallen,
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+ sizeof(p->s), m->str_flags);
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break;
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case FILE_SEARCH: { /* search ms->search.s for the string m->value.s */
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@@ -1979,7 +1983,7 @@ magiccheck(struct magic_set *ms, struct
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return 0;
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v = file_strncmp(m->value.s, ms->search.s + idx, slen,
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- m->str_flags);
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+ ms->search.s_len - idx, m->str_flags);
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if (v == 0) { /* found match */
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ms->search.offset += idx;
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ms->search.rm_len = ms->search.s_len - idx;
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