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compat: make sure git_mmap is not expected to write

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in f48000fc ("Yank writing-back support from gitfakemmap.", 2005-10-08)
support for writting back changes was removed but the specific prot
flag that would be used was not checked for

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Carlo Marcelo Arenas Belón
2018-10-23 05:35:19 -07:00
committed by Junio C Hamano
parent 40f327faf5
commit bf1e6da791
1 changed files with 1 additions and 1 deletions
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2
compat/mmap.c
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@ -4,7 +4,7 @@ void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t of
{
size_t n = 0;
if (start != NULL || !(flags & MAP_PRIVATE))
if (start != NULL || flags != MAP_PRIVATE || prot != PROT_READ)
die("Invalid usage of mmap when built with NO_MMAP");
start = xmalloc(length);