Stack overflow in re_parse_term

[apascovici]

[this is a clone of https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21422 which is now open to everyone]
Using the attached file one can try (N.B. the build must have CONFIG_ASAN=y in the Makefile for this to show)

./qjs e26867.js.TXT

==32654==ERROR: AddressSanitizer: stack-overflow on address 0x7ffee78a8d80 (pc 0x000107da7d7a bp 0x7ffee78a93b0 sp 0x7ffee78a8d80 T0)
#0 0x107da7d7a in re_parse_term+0x8a (qjs:x86_64+0x100250d7a)
#1 0x107da7444 in re_parse_disjunction+0x184 (qjs:x86_64+0x100250444)
#2 0x107da92c2 in re_parse_term+0x15d2 (qjs:x86_64+0x1002522c2)
#3 0x107da7444 in re_parse_disjunction+0x184 (qjs:x86_64+0x100250444)
#4 0x107da92c2 in re_parse_term+0x15d2 (qjs:x86_64+0x1002522c2)
#5 0x107da7444 in re_parse_disjunction+0x184 (qjs:x86_64+0x100250444)
#6 0x107da92c2 in re_parse_term+0x15d2 (qjs:x86_64+0x1002522c2)
...

e26867.js.TXT

[bellard]

fixed

[apascovici]

Excellent, confirmed fix on 2020-11-08 thanks Fabrice!
A.