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sha1_name: fix segfault caused by invalid index access
The code to see if user input "git show :path" makes sense tried to access the index without properly checking the array bound. Signed-off-by: Markus Heidelberg <markus.heidelberg@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -992,6 +992,7 @@ static void diagnose_invalid_index_path(int stage,
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pos = cache_name_pos(filename, namelen);
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if (pos < 0)
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pos = -pos - 1;
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if (pos < active_nr) {
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ce = active_cache[pos];
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if (ce_namelen(ce) == namelen &&
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!memcmp(ce->name, filename, namelen))
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@ -999,6 +1000,7 @@ static void diagnose_invalid_index_path(int stage,
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"Did you mean ':%d:%s'?",
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filename, stage,
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ce_stage(ce), filename);
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}
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/* Confusion between relative and absolute filenames? */
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fullnamelen = namelen + strlen(prefix);
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@ -1008,6 +1010,7 @@ static void diagnose_invalid_index_path(int stage,
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pos = cache_name_pos(fullname, fullnamelen);
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if (pos < 0)
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pos = -pos - 1;
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if (pos < active_nr) {
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ce = active_cache[pos];
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if (ce_namelen(ce) == fullnamelen &&
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!memcmp(ce->name, fullname, fullnamelen))
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@ -1015,6 +1018,7 @@ static void diagnose_invalid_index_path(int stage,
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"Did you mean ':%d:%s'?",
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fullname, filename,
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ce_stage(ce), fullname);
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}
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if (!lstat(filename, &st))
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die("Path '%s' exists on disk, but not in the index.", filename);
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