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authorBen Hutchings <ben@decadent.org.uk>2011-04-23 18:42:56 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2011-04-24 08:24:31 -0700
commit3ba41621156681afcdbcd624e3191cbc65eb94f4 (patch)
tree197b021d9da6cf693fb6b80524e73e228b0bd589
parent686c4cbb10fc0e75b29b097290b4f7fc3f010b9e (diff)
downloadlinux-3ba41621156681afcdbcd624e3191cbc65eb94f4.tar.gz
kconfig: Avoid buffer underrun in choice input
Commit 40aee729b350 ('kconfig: fix default value for choice input') fixed some cases where kconfig would select the wrong option from a choice with a single valid option and thus enter an infinite loop. However, this broke the test for user input of the form 'N?', because when kconfig selects the single valid option the input is zero-length and the test will read the byte before the input buffer. If this happens to contain '?' (as it will in a mips build on Debian unstable today) then kconfig again enters an infinite loop. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: stable@kernel.org [2.6.17+] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--scripts/kconfig/conf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 659326c3e89..006ad817cd5 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -332,7 +332,7 @@ static int conf_choice(struct menu *menu)
}
if (!child)
continue;
- if (line[strlen(line) - 1] == '?') {
+ if (line[0] && line[strlen(line) - 1] == '?') {
print_help(child);
continue;
}