https://bugs.exim.org/show_bug.cgi?id=1704
Bug ID: 1704
Summary: heap-buffer-overflow in compile_branch
src/pcre2_compile.c:6323
Product: PCRE
Version: 10.20 (PCRE2)
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: p...@hermes.cam.ac.uk
Reporter: k...@google.com
CC: pcre-dev@exim.org
Found with libFuzzer+AddressSanitizer on fresh trunk
Feed the following bytes into regcomp with REG_NOSUB
0x20,0xc0,0x60,0x27,0x33,0x28,0x28,0x70,0x28,0x3f,0x27,0x4b,
==27230==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x6040000498f5 at pc 0x00000051cae3 bp 0x7ffd3a848c90 sp 0x7ffd3a848c88
READ of size 1 at 0x6040000498f5 thread T0
#0 0x51cae2 in compile_branch src/pcre2_compile.c:6323:16
#1 0x4f1d7c in compile_regex src/pcre2_compile.c:7369:8
#2 0x5164bf in compile_branch src/pcre2_compile.c:6714:10
#3 0x4f1d7c in compile_regex src/pcre2_compile.c:7369:8
#4 0x5164bf in compile_branch src/pcre2_compile.c:6714:10
#5 0x4f1d7c in compile_regex src/pcre2_compile.c:7369:8
#6 0x4ec154 in pcre2_compile_8 src/pcre2_compile.c:8323:7
#7 0x5d8bc5 in regcomp src/pcre2posix.c:219:23
#8 0x4d59f6 in LLVMFuzzerTestOneInput
(The buffer is the one passed to regcomp)
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