From: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Subject: lib/string.c: check for kmalloc() failure This is mostly to keep the number of static checker warnings down so we can spot new bugs instead of them being drowned in noise. This function doesn't return normal kernel error codes but instead the return value is used to display exactly which memory failed. I chose -1 as hopefully that's a helpful thing to print. Link: http://lkml.kernel.org/r/20170817115420.uikisjvfmtrqkzjn@mwanda Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Cc: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> Cc: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> Cc: Daniel Micay <danielmicay@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/string.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff -puN lib/string.c~lib-stringc-check-for-kmalloc-failure lib/string.c --- a/lib/string.c~lib-stringc-check-for-kmalloc-failure +++ a/lib/string.c @@ -1059,7 +1059,11 @@ EXPORT_SYMBOL(fortify_panic); static __init int memset16_selftest(void) { unsigned i, j, k; - u16 v, *p = kmalloc(256 * 2 * 2, GFP_KERNEL); + u16 v, *p; + + p = kmalloc(256 * 2 * 2, GFP_KERNEL); + if (!p) + return -1; for (i = 0; i < 256; i++) { for (j = 0; j < 256; j++) { @@ -1091,7 +1095,11 @@ fail: static __init int memset32_selftest(void) { unsigned i, j, k; - u32 v, *p = kmalloc(256 * 2 * 4, GFP_KERNEL); + u32 v, *p; + + p = kmalloc(256 * 2 * 4, GFP_KERNEL); + if (!p) + return -1; for (i = 0; i < 256; i++) { for (j = 0; j < 256; j++) { @@ -1123,7 +1131,11 @@ fail: static __init int memset64_selftest(void) { unsigned i, j, k; - u64 v, *p = kmalloc(256 * 2 * 8, GFP_KERNEL); + u64 v, *p; + + p = kmalloc(256 * 2 * 8, GFP_KERNEL); + if (!p) + return -1; for (i = 0; i < 256; i++) { for (j = 0; j < 256; j++) { _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
