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authorMichal Nazarewicz <mina86@mina86.com>2013-11-13 00:08:41 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-13 04:09:12 +0100
commitc725ee54c30b34427cb8fa68d1fe8804aca6d400 (patch)
treeb455af08fbecb6a3f7ddf027cbc4b36d3865bf9e /kernel/delayacct.c
parenterrno.h: remove "NFS" from descriptions in comments (diff)
downloadlinux-c725ee54c30b34427cb8fa68d1fe8804aca6d400.tar.xz
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gen_init_cpio: avoid NULL pointer dereference and rework env expanding
getenv() may return NULL if given environment variable does not exist which leads to NULL dereference when calling strncat. Besides that, the environment variable name was copied to a temporary env_var buffer, but this copying can be avoided by simply using the input string. Lastly, the whole loop can be greatly simplified by using the snprintf function instead of the playing with strncat. By the way, the current implementation allows a recursive variable expansion, as in: $ echo 'out ${A} out ' | A='a ${B} a' B=b /tmp/a out a b a out I'm assuming this is just a side effect and not a conscious decision (especially as this may lead to infinite loop), but I didn't want to change this behaviour without consulting. If the current behaviour is deamed incorrect, I'll be happy to send a patch without recursive processing. Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Cc: Kees Cook <keescook@chromium.org> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Jesper Juhl <jj@codesealer.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/delayacct.c')
0 files changed, 0 insertions, 0 deletions