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kconfig: loop boundary condition fix 

If buf[-1] just happens to hold the byte 0x0A, then nread can wrap around
to (size_t)-1, leading to invalid memory accesses.

This has caused segmentation faults when trying to build the latest
kernel snapshots for i686 in Fedora:
https://bugzilla.redhat.com/show_bug.cgi?id=1592374

Signed-off-by: Jerry James <loganjerry@gmail.com>
[alexpl@fedoraproject.org: reformatted patch for submission]
Signed-off-by: Alexander Ploumistos <alexpl@fedoraproject.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Jerry James 2018-06-23 22:49:04 +02:00 committed by Masahiro Yamada
parent 8b9d271240
commit 73d1c580f9
1 changed files with 1 additions and 1 deletions
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2
scripts/kconfig/preprocess.c
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@ -156,7 +156,7 @@ static char *do_shell(int argc, char *argv[])
nread--;
/* remove trailing new lines */
while (buf[nread - 1] == '\n')
while (nread > 0 && buf[nread - 1] == '\n')
nread--;
buf[nread] = 0;