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lib: errno: check for unsupported error number

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If errno_str() is called with an unsupported error number, do not return a
random pointer but a reasonable text.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Heinrich Schuchardt
2019-10-15 21:46:03 +02:00
committed by Tom Rini
parent 80e7e7c2ab
commit 02e8a8241b
1 changed files with 7 additions and 1 deletions
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8
lib/errno_str.c
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@@ -136,6 +136,8 @@ static const char * const errno_message[] = {
ERRNO_MSG(EDQUOT, "Quota exceeded"), ERRNO_MSG(EDQUOT, "Quota exceeded"),
ERRNO_MSG(ENOMEDIUM, "No medium found"), ERRNO_MSG(ENOMEDIUM, "No medium found"),
ERRNO_MSG(EMEDIUMTYPE, "Wrong medium type"), ERRNO_MSG(EMEDIUMTYPE, "Wrong medium type"),
/* Message for unsupported error numbers */
ERRNO_MSG(0, "Unknown error"),
}; };
const char *errno_str(int errno) const char *errno_str(int errno)
@@ -143,5 +145,9 @@ const char *errno_str(int errno)
if (errno >= 0) if (errno >= 0)
return errno_message[0]; return errno_message[0];
return errno_message[abs(errno)]; errno = -errno;
if (errno >= ARRAY_SIZE(errno_message))
errno = ARRAY_SIZE(errno_message) - 1;
return errno_message[errno];
} }