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Fix possible 1 byte underflow in find_file_extension() #1840

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Sep 23, 2024
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Fix possible 1 byte underflow in find_file_extension() #1840

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2 changes: 1 addition & 1 deletion hts_internal.h
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Original file line number Diff line number Diff line change
Expand Up @@ -129,7 +129,7 @@ static inline int find_file_extension(const char *fn, char ext_out[static HTS_MA
if (!fn) return -1;
if (!delim) delim = fn + strlen(fn);
for (ext = delim; ext > fn && *ext != '.' && *ext != '/'; --ext) {}
if (*ext == '.' &&
if (*ext == '.' && ext > fn &&
((delim - ext == 3 && ext[1] == 'g' && ext[2] == 'z') || // permit .sam.gz as a valid file extension
(delim - ext == 4 && ext[1] == 'b' && ext[2] == 'g' && ext[3] == 'z'))) // permit .vcf.bgz as a valid file extension
{
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