Be more wary of corrupt data in pageinspect's heap_page_items(). The original intent in heap_page_items() was to return nulls, not throw an error or crash, if an item was sufficiently corrupt that we couldn't safely extract data from it. However, commit d6061f83a utterly missed that memo, and not only put in an un-length-checked copy of the tuple's data section, but also managed to break the check on sane nulls-bitmap length. Either mistake could possibly lead to a SIGSEGV crash if the tuple is corrupt.
Bug: #18896 Reported-by: Dmitry Kovalenko <d.kovale...@postgrespro.ru> Author: Dmitry Kovalenko <d.kovale...@postgrespro.ru> Reviewed-by: Tom Lane <t...@sss.pgh.pa.us> Discussion: https://postgr.es/m/18896-add267b8e0666...@postgresql.org Backpatch-through: 13 Branch ------ REL_16_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/2d33cf7b8b699ea0158e27f3b8182b0731f6273b Modified Files -------------- contrib/pageinspect/heapfuncs.c | 45 ++++++++++++++++++++++++----------------- 1 file changed, 27 insertions(+), 18 deletions(-)
