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linux-user: Use "!= 0" when checking if MAP_FIXED_NOREPLACE is non-zero 

In pgd_find_hole_fallback(), Coverity doesn't like the use
of "if (MAP_FIXED_NOREPLACE || ...)" because it's using a
logical operator on a constant other than 0 or 1 and its
heuristic thinks we might have intended a bitwise operator
instead.

The logic is correct (we are checking whether the host really
has a MAP_FIXED_NOREPLACE or whether we fell back to the
"#define as 0 to ignore" from osdep.h); make Coverity
happier by explicitly writing out the comparison with zero.

Fixes: Coverity CID 1431059
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20201103142636.21125-1-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Peter Maydell 2020-11-03 14:26:36 +00:00 committed by Laurent Vivier
parent 81966c1801
commit 36d2dbc72d
1 changed files with 2 additions and 1 deletions
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linux-user/elfload.c
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@ -2188,7 +2188,8 @@ static uintptr_t pgd_find_hole_fallback(uintptr_t guest_size, uintptr_t brk,
PROT_NONE, flags, -1, 0);
if (mmap_start != MAP_FAILED) {
munmap((void *) align_start, guest_size);
if (MAP_FIXED_NOREPLACE || mmap_start == (void *) align_start) {
if (MAP_FIXED_NOREPLACE != 0 ||
mmap_start == (void *) align_start) {
return (uintptr_t) mmap_start + offset;
}
}