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Subject[PATCH] x86/boot: Check if the input parameter (buffer) of the function is a null pointer
Date
If the variable buffer is a null pointer, it may cause the kernel to crash.

Signed-off-by: Liam Ni <zhiguangni01@gmail.com>
---
arch/x86/boot/cmdline.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/boot/cmdline.c b/arch/x86/boot/cmdline.c
index 21d56ae83cdf..d0809f66054c 100644
--- a/arch/x86/boot/cmdline.c
+++ b/arch/x86/boot/cmdline.c
@@ -39,7 +39,7 @@ int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *b
st_bufcpy /* Copying this to buffer */
} state = st_wordstart;

- if (!cmdline_ptr)
+ if (!cmdline_ptr || buffer == NULL)
return -1; /* No command line */

cptr = cmdline_ptr & 0xf;
--
2.25.1
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