Fix possible 1 byte underflow in find_file_extension() #1840
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When checking for another delimiter before .gz or .bgz, the pointer into the string was decremented without checking to see if was at the start. This could lead to a one byte read before the start of the string when copying out the delimiter. Credit to OSS_Fuzz Fixes oss-fuzz id 71740
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When checking for another delimiter before .gz or .bgz, the pointer into the string was decremented without checking to see if was at the start. This could lead to a one byte read before the start of the string when copying out the delimiter.
Credit to OSS_Fuzz
Fixes oss-fuzz id 71740